Interphase Proble, Probe Operation Manual

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O

PERATION

M

ANUAL

1

To Our Customer:

Thank you for choosing the Interphase Probe Forward Scanning Sonar. Throughout the
development of this fine product, we have been primarily concerned with creating a unit that
offers the best possible value for your money. Selection of features, ease of use, superior
performance and outstanding reliability were the benchmarks upon which all important design
decisions were made. We feel proud of the Probe Forward Scanning Sonar and your satisfaction
is very important to us. To this end, we welcome any comments or suggestions that you might
have in regard to this equipment.

It is very important that you complete and return the WARRANTY REGISTRATION CARD
within 15 days of purchase so that your unit may be protected under the warranty.

Sincerely,

INTERPHASE TECHNOLOGIES, INC.

Interphase Probe™ is a trademark of Interphase Technologies, Inc.

©2005 Interphase Technologies, Inc.

Publication # = PROBE 4.3-DOM
Part# 25-0028-029

2

Table Of Contents

Important Notice 5
Principle of Operation 6
Display Unit Installation 8
Selecting the Transducer configuration for Your Boat ______________________________________________ 10
Transducer Installation 11
Basic Operation 18
Getting Started 22

Demo Program, Display Contrast 24
Units of Measure 25
Language Selection 25
Level Adjustment 25

Range Adjustment 26
Sensitivity Adjustment 26
Alarm Adjustment 27
Beam Width & Direction Adjustment

Range 29
Mark 30
Center 30
Reset 30

Range Adjustment 31
Sensitivity Adjustment 31
Bottom Hardness 32
Alarm Adjustment 32
Zoom & Bottom Track 31
Fish Symbol ID 34

Range Adjustment 35
Log Reset 35
Sensitivity Adjustment 35
Alarm Adjustment 36
Beam Width & Direction Adjustment 37

Range 38
Mark 39
Center 39
Reset 39

Range Adjustment 40
Sensitivity Adjustment 40
Alarm Adjustment 41
Beam Width & Direction Adjustment 42

Set-Up View 24

Forward View (Full Scan) 26

28

Plot (Track Plot) View 29

Chart View 31

Data View 35

Chart/Plot View 38

Chart/Scan View 40

NMEA 0183 Interface 43
Interpreting Your Probe Display 44

Distance Forward 45
Noise and Sensitivity Adjustments 45
Transducer Sidelobe Effect 45

Reference Information 47
Frequently Asked Questions (FAQ’s) 50
Maintenance 52
Troubleshooting Guide 53
Interference Problems 54
Specifications 55
Faxtory Reset and Speed Calibration 56
How To Obtain Service 57
Warranty 59

3

General Information

T

hank you for your selection of the Interphase Probe

Forward Scanning Sonar. The Probe’s ruggedly built,
compact design makes it ideal for installation on nearly any
boat. It will display water depth, bottom conditions and
submerged objects such as fish, or objects in your path, on its
high resolution display. The Probe is available with either a
transom or thru-hull scanning sonar depth transducer. In
addition, an optional speed/temperature transducer (either
transom or thru-hull) is available which will enable your
Probe to display boat speed, elapsed distance and surface
water temperature. Refer to the accessories part numbers
printed in the Transducer Installation section (Page 17) of
this manual, then see your dealer or call Interphase to order.

The Probe has an unprecedented number of advanced features,
in addition to the forward scanning capability, to make your
boating safer and your fishing more productive. Its high
resolution SuperTwist Liquid Crystal Display (LCD) provides
split screen views of 4X magnification zoom and bottom lock,
large digital display, speed and temperature (with the speed/
temperature transducer). You will appreciate the very useful
features of fish and depth alarms, manual or automatic gain
control, bottom hardness indicator and fish symbol
identification.

The Probe allows operation in your choice of nine languages:
English, French, Italian, Spanish, German, Danish, Finnish,
Swedish, or Greek. Power-off memory saves language, depth
range, gain and contrast settings, screen advance speed and
location in screen menu. Due to its unique multi-tasking
operation, the Probe provides instant full screen updates when
switching between modes (no data loss).

If you have your Probe interfaced with a Loran-C or GPS unit
(NMEA version 2.0, non-differential), you can take advantage
of the included track plot displays. The Loran-C, DECCA, and
GPS track plot displays on the Probe give a whole new
dimension, enabling you to not only see the depths beneath and
in front of your boat, but also to see a graphic display of your
boat’s position and progress over time. The track plot display
makes it easy to find and return to the same fishing spot, or to
troll back over the same productive areas.

4

To ensure that you receive the maximum benefits available
from the outstanding features of the Interphase Probe, please
carefully follow the steps outlined in this manual. An
instructive demonstration simulator has been designed into the
Probe and we highly recommend that you spend some time
using the demo mode prior to actual use of the unit. We also
recommend that you read this entire manual before attempting
to either install or operate your Probe.

Warranty Information

Interphase provides a limited warranty on the Probe Forward

Scanning Sonar. We strongly urge you to read this warranty
(reprinted at the back of this manual) and closely follow its
terms and conditions should your Probe require repair. It is
highly recommended that you save all packing materials so
that if you should need to send in the unit for repair, it can be
fully protected. If you wrap your display unit in the original
plastic bag and ship it in the box with cardboard inserts, this
will protect your unit from scratches and shock during
shipment.

Should you experience a problem with your Probe, first refer
to the Troubleshooting section (Page 53) of this manual.
Most common problems and their solutions are described here.
If problems persist, call Interphase Product Support at:
[phone]. We will be happy to try to assist you, and if
required, we will give you instructions on how to quickly get
your set repaired.

The enclosed warranty registration card must be completed
and returned to Interphase within 15 days of purchase so that
your unit may be protected under the warranty. Failure to
return the warranty card may cause unnecessary delays in
processing your unit for warranty repair.

WARNING

Navigation based solely on one method or
one instrument should never be practiced.
While the Probe can be quite useful in
showing underwater structure and changing
bottom conditions both below and in front
of your vessel, there are many situations
and conditions which can cause erroneous
or distorted readings.

In addition, there are many situations that
can cause “blind spots” in the Probe’s field
of view including the presence of
temperature inversion layers (thermoclines),
water turbulence, and high concentrations
of suspended particles in the water.

While the Probe can be considered as a
useful aid to navigation, it should never be
the only means of navigation.

IMPORTANT NOTICE

Since the Probe’s Forward Looking
technology is revolutionary, there is a
strong possibility that we will develop
many new and exciting features in the
future. We would like to make sure we can
send you information about these new
features and enhancements.

Please fill out and return the Warranty
Registration Card immediately. This is our
only method to keep in contact with you
and we may want to advise you of future
enhancements to your Probe.

If future changes or improvements are
made, software upgrades will be available
for a nominal charge.

5

Award Winning

Technology

For its pioneering work in
developing Phased Array
Scanning Sonar, Interphase
Technologies won the
prestigious IMTEC
INNOVATION AWARD.

The Probe’s Forward
Looking Scanning Sonar is
based on this same award­winning technology.

Principle of Operat

The Probe Forward Scanning Sonar uses a proprietary
phased array acoustic technology first developed for marine
use by Interphase Technologies. Known as “phased array
ultrasound technology”, its capabilities have been proven in
the military and medical industries for many years. The
amazing video images provided by medical ultrasound
equipment are familiar to most people and clearly demonstrate
the technology’s ability to show highly defined images in a
"real time" or "live action" mode. Interphase has taken this
same technology and modified it for use in the marine market.

Most present day fish finders/ depth sounders all work on a
principle developed during W.W. II, called SONAR, where
acoustic pulses are used to detect the presence and range or
distance to an underwater object. During the 1950’s, several
devices which used sonar principles were developed and
marketed to fishing and boating enthusiasts to detect the
distance to the bottom (depth) and to indicate the presence of
any intervening submerged objects - such as fish.

An acoustic array is a group of piezoelectric ceramic elements
that are precisely sized and spaced. Each element will send
and receive acoustic pulses, as when used in more
conventional single element depth sounders. However, when
all elements in the array are sending or receiving acoustic
energy at the same time, the entire array behaves like a single
larger element with one important difference: the ability of the
array to concentrate its acoustic energy in different directions,
depending on the different “phasing” of the signals applied or
received by each element. Depending on the signal phasing of
the array, acoustic beams can be directed in an almost
unlimited number of directions. For example, using an 8
element phased array transducer, the Probe is capable of
steering the acoustic beam in any of 90 different directions.
Conventional fixed-beam technology would require the use of
90 different elements to duplicate this capability. The
resulting transducer would be much too large and costly to be
of any practical use.

Since the acoustic beam in the phased array is steered
electronically, requiring no moving parts, it can be quickly and
reliably scanned and re-scanned over a large area. When
displayed, the changing information between subsequent scans
takes on an almost animated quality - for example, showing
movement of underwater targets such as fish or rapidly
changing bottom conditions.

In addition to Interphase’s ability to electronically steer an

ion

6

acoustic beam, the phased array has other patent pending
advantages over fixed-beam technologies, such as: allowing
the user to adjust the transducer beam width, to scan large
areas limited only by the physics of the speed of sound in
water (5,000 feet/second), and the ability to provide nearly real
time or live action underwater views.

When operating, the Probe converts a small amount of
electrical current from your battery into ultrasonic sound
pulses, which are then fed to the phased array transducer.
These acoustic pulses travel out from the transducer in a cone
shaped pattern, called the cone angle. When the sound pulse
strikes an underwater object, it is reflected back (echo return),
received by the transducer and converted back into small
electrical impulses. These impulses are amplified, then
displayed as an image on the LCD screen.

The strength of the echo, the depth of the object, and the angle
of the transducer’s beam all affect how the image appears on
the display. Other factors which affect the image include boat
speed relative to the movement, position of the underwater
target and the number of objects reflecting pulses back to the

Probe.

Please Note:

Learning to properly interpret scanning sonar takes both
patience and experience, but once mastered, the Probe can
offer tremendous operational advantages over conventional
fixed-beam depth sounders. It is also important to realize that
while the Probe shows the bottom in both the forward and the
conventional downlooking mode, the presentations are really
quite different. The forward scan shows a view as the beam
“sweeps” across the bottom, while the conventional
downlooking view shows a history of repetitive soundings
packed tightly together.

7

Overhead

Shelf/Table

Panel Flush Mount Installation

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Optional In-Dash mounting bracket, Interphase
part # 17-0054-008 is required for in-dash or
panel mounting.

Installation

Display Unit

The compact size of the Probe display unit allows for
easy installation in almost any vessel. To get maximum
performance and life from your unit, the following
guidelines should be considered when selecting a
mounting location:

1) Select a location where the unit is protected from
excessive temperatures. Heat is one of the worst enemies
of electronic components, and will accelerate component
aging, thereby reducing the trouble-free life of your

Probe.

2) Mount the display in a location where it will be

convenient to route the power cord and transducer cable.

Power connection

Connect the two-pin plug on the end of the power supply
cable to the power supply jack located at the rear of the
main display unit. Connect the red wire to the positive
terminal and the black wire to the negative terminal of
your boat’s 12 VDC battery.

To minimize electrical interference, carefully route the
power cable so that it does not run parallel or close to the
transducer cable, engine, refrigeration, bilge pump or any
other critical wiring.

IMPORTANT: The Probe’s 12 VDC power leads
should go directly to the boat’s battery, distribution board,
or breaker panel. Instability of the display may result if
the unit has to share leads with other electrical systems
aboard your boat.

Wiring for Power and Transducer
Connectors

The correct pin-out wiring sequences for the power and
transducer connectors are shown at right. DO NOT
SHORTEN THE TRANSDUCER CABLE. If a
transducer cable longer than the 30’ length supplied with
your unit is needed, please contact your Interphase
dealer. A 30-foot scanning sonar transducer extension
cable is available. (P/N 04-0014-008)

8

DANGER: Removal of any connector, disassembly of
transducer, shortening of any cable or use of any cable
other than that supplied by Interphase will void your
warranty. NO EXCEPTIONS.

Cable Connectors

(view from front of female plug)

Transducer:
1 White 1st element
2 Brown 2nd element
3 Orange 3rd element
4 Yellow 4th element
5 Green 5th element
6 Blue 6th element
7 Violet 7th element
8 Gray 8th element
9 Shield Ground/Return

Speed/Temperature Input

1 Speed Data
2 +5VDC
3 N/C
4 N/C
5 N/C
6 +Temp. Sensor
7 -Temp. Sensor
8 Shield/Ground

Power Connector
1 +12 vdc
2 - (Ground)

NMEA Input
1 Data
2 Return ( Ground)
3 N/C

Transducer
(9-pin)

Red Wire NMEA 0183

12 Volt Battery

Speed/
Temp.
(8-pin)

Input (3-pin)

12 VDC
Power Cable
(2-pin)

N/C = No Connection

9

Selecting the Transducer
Configuration for your Boat

Keep in mind the primary rule for transducer operation.
This is: the transducer can function as long as it has an
unobstructed forward view and has smooth flowing
non-aerated water surrounding it.

The first line of inquiry should be about the boat.
Transom mounted transducers are intended for low
speed boats with external props. Boats with inboard
motors and boats that regularly exceed 40MPH cannot
use transom mounted transducers. Inboard motors
create aeration and excess turbulence that prevent the
transducers from operating properly. I/O motors where
the prop is aft of the transom do not create this
situation. Be careful that the driveshaft of the I/O does
not block the forward horizontal scan. Boats that exceed
40MPH run a risk of having the transom mounted
transduers torn free of the transom. The transom
mounted transducers are not designed to be used at
these speeds.

In addition, the transom mounted transducers are
mounted on kick-up brackets. This allows the brackets
to kick up at about 35-40MPH. This is intended to
allow the transducers to kick-up if they strike an
object, or to be pulled up when trailering a boat. Once
kicked up, the transducers must be manully reset in
order to function.

Thru-hull transducers are for boats that exceed 40MPH
and /or have inboard motors. Transducer placement
depends on boat size, speed, hull configuration and
sonar application. On displacement hulls, the
transducer is generally located 1/3 aft of where the bow
meets the water line. This is the farthest forward the
transducer should ever be mounted. It is important that
the transducer be below turbulent aerated water created
by the bow.

Special Thru-Hull Mounting Considerations

On sailboats with a fin keel, the transducer is most often
placed at the leading edge of the keel and sometimes
faired into the keel. As this location may be where the
sling rests when hauling the boat, the transducer may be
placed on either side of the hull with the foremost face
of the transducer even with the leading edge of the keel.

Alternatley, the transducer may be placed forward of the
keel ahead of the lifting strap location. This should not be
ahead of 1/3 aft of where the bow meets the waterline.

On planing hulls the transducer is typically placed near
the transom. This is to provide smooth flowing water at
the greastest speed. However, most planing hull boats
create transducer aeration when on plane regardless of
transducer location.

It should be noted that thru-hull transducers can effect
boat performance in two important ways. The first
concern is cavitation created by the transducer that causes
reduced engine performance by disrupting water flow
around the propeller. This is smoothed out by the hull in
some boats, but on planing hulls with the transducer near
the transom, the hull is not able to clear the cavitation.
The second concern is uneven drag on high-speed boats.
This may occur when the thru-hull transducer is mounted
far off of the centerline of the boat. At low speeds and on
large boats the effect is negligible. On smaller boats at
high speeds the drag can effect the steering. The effect
increases as the boat’s speed rises. Boats with trim tabs
can usually trim this out, but boats without trim tabs may
feel a pulling sensation toward the transducer side of the
boat.

A less intuative mounting location for the thru-hull
transducer on a planing hull is on the centerline just
forward of midship. The goal in this mounting is to place
the transducer so that it is out of the water at planing
speed. As most transducers are aerated at planing speeds,
this removes the transducer from the water flow
preventing cavitation and steering problems. Most
applications for forward scanning sonar occur when the
boat is at low non-planing speeds, including fishing and
navigating hazardous waters. Under these speed
conditions the transducer is in the water.

On trailered boats, be certain that the mounting is such
that the boat does not rest on the transducers. This could
result in damage to the transducer and/or boat hull.
Explore possible mounting locations while the boat is on
the trailer.

10

Side & Front View
showing Probe
Scanning directions.

Transom Mounted Transducer

Forward

Thru-Hull Transducer

Side View

Forward Direction

Top View

Transducer Installation

The Probe comes standard with either a thru-hull or
transom mounted forward scanning transducer. It is
important to position the transducer so that it has as clear a
view as possible of the water directly below and ahead of
your boat, as indicated at left.

The scanning transducer must be positioned properly so that
it scans in the proper direction (i.e. from in front of the boat
to the bottom below). The sketch at left shows the proper
orientation for both the transom mount and thru-hull
transducer.

NOTE THAT ON THE TRANSOM MOUNT
TRANSDUCERS, THE ROUNDED SIDE MUST
POINT FORWARD, AND ON THE THRU-HULL
TRANSDUCER, THE MORE BLUNT AREA MUST
POINT FORWARD.

General Considerations

DO NOT CUT OR SPLICE YOUR PHASED ARRAY
TRANSDUCER CABLE OR REMOVE THE 9-PIN
CONNECTOR BECAUSE THE SYSTEM
PERFORMANCE MAY BE SERIOUSLY
DEGRADED. THIS ACTION WILL VOID YOUR
WARRANTY. NO EXCEPTIONS.

If you need a longer length cable than comes with the
transducer (30’), then purchase the optional 30’ extension
cable, Interphase Part # 04-0014-008. It is recommended
that only one extension cable be used as additional
extensions will decrease the effective power and depth
range.

1) Choose a location where there is the least amount of
acoustic noise, air bubbles or turbulence caused by the
boat’s movement. The transducer should not be located
nearby or especially directly behind or directly in front of
the propeller.

2) Choose a location where the transducer can be mounted
so that it will be level to the water’s surface and will not be
tilted to either side. Otherwise the transducer will not scan
from the surface ahead to directly beneath the boat.

3)The transducer must always remain submerged,
regardless of the speed of the boat and should not be
mounted where it could be damaged by underwater
obstacles or when loading on a trailer.

11

4) DO NOT locate the transducer in the extreme bow of the
boat where it will be subject to intense turbulence as the
boat pounds through the water.

5) DO NOT locate the transducer directly behind any hull
protrusion which will cause the water to be turbulent when
it reaches the transducer or which will obstruct the
transducer’s forward looking view. For displacement-hull
power and sail boats, the thru-hull installation is usually
required.

6) DO NOT force the cable by pulling on it. This may
cause damage to the internal transducer wiring.

DANGER: DO NOT allow any solvents, i.e. gasoline,
acetone, to come in contact with the transducer or head unit
as this may dissolve the plastic material.

Transom Transducer Kick-Up Bracket

The transom transducer is attached to the boat with a heavy­duty stainless steel kick-up bracket to provide protection
against impact. When the transducer strikes an object, or
the water force exceeds the resistance of the bracket, the
transducer automatically kicks up and becomes non­operational. The bracket does not automatically reset at
lower speeds. The transducer must be manually returned to
its operational position.

The transducer is designed to kick up at speeds between 35
and 40MPH (30-35 knots). We do not recommend transom
mount transducers on boats that regularly exceed 35MPH
(30 knots). Boats that exceed 40MPH (35knots) cannot

use transom mounted transducers, but must use thru­hull transducers.

Special Note: The kick-up feature is designed as a safety

consideration to prevent the transducer from being removed
from the boat due to impact or excessive speed. The kick­up bracket is not designed for repeated kick-up or to be
pulled up manually during loading and unloading from boat
trailers. Tests have shown that the bracket can kick-up as
many as 30 times before there is a negative effect on the
bracket. Repeated kick-up will cause the transducer to
kick-up at progressively lower speeds. Excessive kick-ups
can cause the transducer bracket to fail. Brackets that fail
due to repeated kick-up are not covered under warranty.

If the transducer must be kicked up for installation, boat
service or loading, the nylok nut on the end of the bracket
axle can be loosened. Tighten the nut to 50 inch pounds of
torque before operating the boat.

30’ Extension Cable

9-pin
Male

Interphase Part #

04-0014-008

9-pin
Female

Transom Mount Bracket in Released Position

Note: Will

not work at

speeds above

35 MPH

Suggested materials required for installation:

♦

capacity of 10mm (3/8”) or larger.

♦

transom hole to route cable and
connector

♦

♦

♦

♦

Variable speed electric drill with a chuck

Hole saw or spade bit 19 mm (7/8”) for

Chamfer bit or 6 mm (1/4”) drill bit

Drill bit No. 28 or 4 mm (9/64”)

Drill bit 3 mm (7/64”)

Marine bedding/sealing compound

12

Nylok Nut

8

5

7

Bracket

Axle

6

4

3

Kick-up Bracket Replacement Parts

If during installation parts are somehow lost are damaged, they
can be replaced as follows:

Part# 17-0088-008 - Spray Shield Kit - Includes: Spray Shield,
four Mounting Bolts and Nuts, Rubber Grommet and four
Large Mounting Screws.
Part# 17-0089-008 - Transom Transducer Hardware Kit ­Includes: Complete Bracket Axle Assembly and four Large
Mounting Screws.
Part# 17-0056-008 - Kick-Up Bracket Assembly - Includes:
Complete Bracket Axle Assembly, four Large Mounting
Screws and the Stainless Steel Mounting Bracket.

Bracket Axle Assembly

On some boats it will be neccessary to remove the Bracket
Axle during installation. See the diagram to the left and
instructions below for details on assembling the axle.

1. Place one stainless steel washer onto the axle against the hex
end.

2. Place one small stainless steel spacer against washer.

3. Slide two urethane spacers over the small steel spacer.

4. With the transducer bracket in place, align the long stainless
steel spacer with the mounting holes of the mounting bracket
and slide the axle in place through the spacer.

5. Place one small stainless steel spacer against the transducer
bracket.

6. Slide two urethane spacers over the small steel spacer.

7. Place one stainless steel washer onto the axle against the
urethane spacer.

8. Place the nylok nut onto the threaded end of the axle and
tighten to 50 inch pounds. If you do not have a torque wrench,
tighten until the nut will not turn easily. The stainless steel
spacers should prevent over-tightening.

Transom Mounting Location

The main source of vessel acoustic noise is the propeller. It is
very important to position the transducer to minimize noise
pickup and provide as clear a view as possible of the water
ahead of the boat. Study the hull shape of the vessel carefully

2

to determine the best transducer mounting location. To
achieve optimal operation the transducer should be mounted in
a spot which:

1

•

Minimizes acoustic noise reception.

•

Minimizes the chance that aerated water will flow across
the transducer’s frontal nose area.

•

Optimizes the transducers view of the area ahead and
directly below the boat.

13

The transducer can be installed on either side of an

Twin Outboards

outboard or inboard/outboard engine, or between twin
outboards. For single engine installations, normally 18”
to 24” outboard of the propeller center line is acceptable
and the down stroke side of the propeller is preferred.
Choose a location where water flow is smoothest. For
dual engine installation, just off the center line is
usually acceptable.

Because the transducer rotates back and upwards when
the bracket releases, it must be mounted in a location
where there is sufficient clearance and headroom to
allow the full release.

Attaching the Transducer and Spray
Shield to the Bracket

Locate the Stainless Spray Shield inside the
transducer’s stainless mounting ears. Make sure spray
shield is orientated as shown in sketch on the right.

Then, assemble the stainless kick-up bracket to the
transducers using the 4 screws, washers and lock nuts
provided. The bracket arms must be mounted outside
the stainless steel mounting ears of the transducer. Do
not fully tighten the lock nuts at this time.

Position the transducer so that it is perpendicular from
side to side and make sure the rounded shaped area is
pointed towards the front of the boat.

Mounting the Transducer to the Boa

After you have selected the optimum mounting location
and have assembled the mounting bracket to the
transducer, mount the bracket onto the hull as shown on
the right.

Make sure to position the transducer so that it is level in
the fore and aft direction and so it will look straight
down. Check the location of your boat’s waterline and
position the flat top surface of the transducer so that it is
parallel to the waterline as shown below.

Note: If the transducer is not mounted so that its fore
and aft direction is parallel to the surface, then the
forward looking display will be distorted and flat
bottoms will appear to be slanted upwards or
downwards. After mounting the transducer and actually
using the Probe on the water, you may need to readjust
the transducer’s mounting for optimum performance.

t

Transom Mount Locations

Cable

Transducer

18 - 24"

Cables

Bracket

Axle

Rear
View

Rubber

Grommet

Fasten Spray Shield with
4 screws & nylok
washers as shown

Side

View

Spray
Shield

Waterline

Fasten Spray Shield

with 4 screws & nylok

Transducer must be

mounted vertically

Mounting
Bracket

washers as shown

Spray Shield

Waterline

Boat Hull

14

Suggested Thru-Hull

Transducer Locations

Fin Keel

L = waterline length

Displacement Hull

~ 1/3 L

Planing Hull

Thru-Hull Transducer Installation

The thru-hull transducer is the recommended choice for
larger boats with in-board engines. Thru-hull mounting is
usually required on larger power and sail craft in order to
find a mounting location free of forward looking hull
obstructions. The Probe must have a clear view of the
water ahead as it can not magically see through obstructions
such as the vessel’s hull. Please read the following
carefully before starting the thru-hull installation.

Normally, thru-hull installations are performed by a
professional in a boat haul-out facility. We suggest you
seek professional assistance before attempting to mount this
transducer.

Selecting the Best Location

The best location to mount the thru-hull transducer will
vary with the type of boat. Try to find a location with the
smallest dead rise angle to make installation easiest.

a. On displacement hulls (sailboats, trawlers, etc.) locate
the transducer about 1/3 aft along the waterline. Generally
this provides the best compromise between obtaining
aeration-free water and minimizing propeller noise. The
Probe’s transducer can not see through aerated water and
water near the bow and near the keel can be quite aerated.
Aeration of the transducer can be minimized by keeping the
transducer mounted away from the keel and by not
mounting too far forward.

b. On sailboats, the transducer should be mounted where
the acoustic beam will not be shaded by the keel. A spot
forward of a fin keel is usually best. Try to find an
accessible spot with a minimum dead rise angle.

c. On planing powerboat hulls, the transducer should be
mounted well aft and close to the keel to insure that the
transducer is in contact with the water at higher boat speeds.
On I/O’s, transducer mounting close to the
engine usually yields good results.

On inboards always mount the transducer
well ahead of the propeller(s). Turbulence
from props can seriously degrade perform­ ance. (Thru-hull installation is recommended.)

d. Mount the transducer on the side of the hull where the
propeller is moving downwards. The upward motion of the
propeller generates pressure waves and pushes bubbles up
against the transducer’s face causing a loss of signal.

15

DO NOT install a bronze transducer housing directly into
an aluminum or steel hull because electrolytic corrosion
will occur. Consult your boat-yard for information on
stainless or plastic sleeves.

IMPORTANT:

1) Make sure the water flow across the thru-hull
transducer is bubble and turbulence free at all speeds if
good performance is to be achieved.

2) Make sure the transducer has an unobstructed view of
the water ahead and below the boat.

3) On displacement-hull power boats, the transducer
should be mounted relatively close to the center line of
the hull.

4) Mount the transducer in a place which has reasonable
access from inside the vessel since the transducer’s
bronze nut will require tightening from inside the hull.

Because the Probe scans a 12 degree beam from the
surface ahead to directly below the boat, it is important to
make sure that the transducer is installed so that it will
scan in a vertical direction and not off to either side. The
transducer must be mounted so that it’s bronze stem is as
perpendicular to the water line as possible. If necessary,
use a fairing block to properly position the transducer.

Use of a Thru-hull Fairing Bl

Nearly all vessels have some dead rise angle at the
transducer mounting location. If the thru-hull transducer
were mounted directly to the hull, the sound beam would
be tilted off the vertical at the same angle as the dead-rise.
Most thru-hull installations will require a fairing block to
insure the transducer is mounted properly.

A fairing block is typically made of teak, mahogany or
plastic and should be glued between the transducer and
hull (both inside and outside) to insure that the
transducer’s mounting shaft is perpendicular to the
water’s surface. Make the fairing block as smooth as
possible, and not bigger than the transducer’s face, to
minimize possible turbulence.

After cutting the fairing block, trial fit the block to the
hull. It is very important that the flat top surface of the
transducer be parallel to the water. Because of the skill
required, we suggest that your professional boatyard
provide the fairing block. Molded plastic fairing blocks
are also available to fit the Probe’s transducer. Contact
us at [phone] for additional information and
where to purchase.

ock

Mount Transducer so bronze stem is Vertical

Waterline

Keep parallel

Hull

to waterline !

Forward

Transducer

Bronze
Hex Nut

Waterline

Fairing
Block

Keep parallel

Hull

Boat’s
Hull

to waterline !

Wood or
Plastic
Fairing Block
(Add sealing
compound
between
faring block
& hull).

Transducer

16

MOLDED FAIRING BLOCK

If your installation requires a fairing block, you
may either have one made locally, or purchase
a molded plactic unit from Interphase or your
Interphase distributor.

For this transducer, the molded Fairing Block
Part Number is:

42-2004-000

OPTIONAL SPEED/TEMPERATURE

INTERPHASE DESCRIPTION
PART #

T1-0200-021 Transom mount S/T
transducer

T1-0200-027 Thru-hull mount S/T
transducer

04-0009-008 30’ S/T Extension Cable
Both the transom and thru-hull S/T transducers

are separately installed. The transom mount S/T
transducer can be used with the thru-hull depth
only transducer if desired. The 30’ S/T
transducer cable and the depth only transducer
cable both plug directly into the back of the
display unit.

To order, call your local Interphase dealer, or

Interphase direct at (831)4 77-4944.

TRANSDUCERS

Installing the Thru-hull Transducer

1) Drill a 1/8” pilot hole from inside the hull to assure
access to tighten the housing nut and clearance for the
transducer cables. If there is any hull irregularity near the
mounting location, it may be desirable to drill from the
outside.

2) Use a 1-1/16” hole saw and drill the hole from the
outside of the hull. Sand or clean the area around the hole,
inside and outside to insure that the sealing compound will
adhere properly to the hull. Select a marine grade adhesive
sealant, such as 3M 5200, and use according to the
instructions.

3) Remove the bronze hex nut from the housing and cable.

4) Uncoil the transducer cable and thread it through the
hole into the inside of the hull. DANGER: DO NOT apply
tension to the transducer cables as this may sever internal
connections.

5) Apply a 1/8” thick layer of sealant on the upper flat
surface of the transducer, bronze alignment pin and fairing
block (if used).

6) From the outside of the hull, push the housing into the
1” hole. Twist the housing slightly to squeeze out excess
sealant. Carefully confirm that the transducer is aligned so
that the round front end is pointed directly toward the front
of the boat.

7) Install and tighten the bronze hex nut (allow for swelling
in wooden hulls).

8) Remove excess sealant from the outside to assure
smooth water flow over the transducer.

DANGER: Wood hulls and fairing blocks will expand
after the boat is put back into the water, so it is important
that the transducer be only hand-tightened until the wood
fully expands. Otherwise the wood fairing block may
crack.

DANGER: Be sure to check for leaks when the boat is
placed in the water. Allow at least 24 hours after
installation for any leak to appear.

DANGER: If the boat is kept in saltwater it is
recommended that the transducer be coated with an anti­fouling paint. USE ONLY WATER BASED ANTI-

FOULING PAINT. DO NOT USE KETONE BASED
PAINTS. Ketone based anti-fouling paint will attack the

plastic materials used in the transducer. See page 52.

17

Interphase Probe

Softkeys

Short-cut

In this manual you will find
instruction on how to change all
adjustable settings by using the
“soft keys”. However, any setting
adjustment can be done (when the
appropriate menu selection is made)
by turning the control knob.

Settings which can be adjusted by
using the control knob are:

Range
Alarm
Contrast
Sensitivity
Zoom
Beam Sector Width & Direction

LCD screen contrast can be changed
any time while in the Control
Center simply by turning the
control knob.

Power On/

Off

Basic Operation

The Probe has been designed to be as easy to learn and operate
as possible. The raised push-button keys provide a tactile feel
to each operation and the Probe responds with an audible beep
each time a key is pressed. All keys necessary for operation of
the unit are on the front panel. The Probe uses a unique
approach called “soft keys” along the bottom of the display.
These five keys are labeled by the LCD display and are
controlled by the unit’s software, thus the name “soft keys”.

In addition, a large front panel rotating knob eliminates the need
for multiple button pushes while making gain, depth range,
display contrast and many other adjustments. The knob
provides easy and quick adjustments while giving the user a
familiar style of operation.

The “soft key” buttons allow very easy operation as they almost
guide you along, even though the Probe possesses an amazing
number of advanced sonar features. It would take a
considerable number of additional buttons and greatly add to the
unit’s operational complexity if each function had a dedicated
button instead of using the “soft key” approach. In addition, the
use of “soft keys”, coupled with the front panel adjustment
knob, allow for easy future software upgrades which may
include new important features. The use of fixed, permanently
labeled buttons would severely limit any future upgrade ability.

User Interface

The Probe is a very advanced product with many features never
before found on marine instrumentation. In order to provide
these sophisticated new features while continuing to keep user
operation simple and easy to learn, several new design
approaches were adopted. Some of the more significant
approaches are described in the following.

Multi-Tasking Operation

The Probe’s Multi-Tasking operation was developed to make
sure your time would not be wasted whenever you change
screen displays. When changing displays with other
conventional systems, the microprocessor has to completely re­assemble a new display picture which can take a considerable
amount of time. These time delays can be very frustrating and
are unnecessary if a Multi-Tasking operating system is used.

18

Pre-Programmed Screen Displays

Rather than ask you to “build” different screen displays while
operating the unit, the Probe has seven of the most valuable
LCD screen displays pre-programmed into its operating system
memory. Thanks to the Multi-Tasking operating system, each
of these pre-programmed displays (known as Views) are
always being updated, regardless of which screen display is
presently being used. This means, for example, that the two
Track Plotter’s will continue to plot and update your vessel’s
position - even while you’re looking at a Zoomed picture of
the bottom! Similarly, even while viewing your vessel’s
position on one of the Track Plot displays, the digital and
graphic depth screens are simultaneously being updated in the
background - ready for immediate access. And, thanks to the
lithium battery memory backup, as described in the next
section; ranges, gain, zoom and other settings are remembered
as you go from View to View and are even remembered when
you turn the unit off.

Internal System Memory

There is nothing so frustrating as having your fishfinder re­start when you start your boat’s engine and having to
completely re-set the range, gain, contrast and all your other
settings. Because the Probe contains an internal lithium
memory battery, it remembers all system settings with the
power removed. When you turn your Probe on, it will
immediately start in the last View that you used, complete with
the proper range, zoom, gain and other important settings.
Instead of using a non-volatile RAM, a lithium battery was
used to ensure a long error-free memory life. Most non­volatile RAM’s exhibit increasing errors with time and can
become a serious problem after only 100,000 operations.

Cold Cathode Backlight

The Probe has the best LCD backlight system available. It
uses a Cold Cathode Fluorescent lamp (CFL) with
exceptionally long life characteristics which greatly exceed the
more common electro-luminescent and incandescent bulb
backlights. In addition to its exceptional reliability, the cold
cathode lamp provides a much more visible display than other
backlight systems. Screen clarity and contrast are greatly
enhanced. The typical half-life (when output brightness
diminishes to 1/2 its original value) of the cold cathode
backlight is in excess of 20,000 hours. A typical electro­luminescent panel, for comparison, has a half life of only 2,000
hours!

Interphase Probe

Control
Knob

Pre-Programmed Screen Displays

19

Control Center Softkey Menu

Typical Sub-Menu

Common Soft Key Functions

The Probe’s innovative Multi-Tasking operating system is
controlled through the Control Center, where several
different screen displays (views) can easily be selected by the
push of a button. Each of these screens (views) reside in the
Probe’s internal memory and all are being updated in the
background, regardless of which screen is currently being
displayed. This allows the Probe to provide instant full screen
displays of different features with no data loss on other
screens.

On many of the display screens you will note a recurrence of
the left most soft key labeled “MENU”. When the MENU
soft key is pressed, the Probe will return to the Control
Center display. Use of the MENU soft key is required in
order to return to the Control Center where another mode of
operation (i.e. forward looking, track plotting, etc.) can be
chosen.

Power/Backlight Key

Press the "Power/Backlight" key located at the lower right of
the unit to turn the Probe on. The unit will respond with an
audible beep when it turns on. Pressing this key again turns
the backlight on and off, each time accompanied by a beep.
To turn the Probe off, press this key and hold it down for
several seconds until the unit goes off.

Demo/Simulator Mode

Your Probe includes a built-in DEMO simulator program
which makes it easy to practice with the unit and to get a
feeling for its many features before actually using it in real
situations on the water. We highly recommend you run
through this section on operation of the Probe with the
DEMO mode activated to first learn basic feature controls.
The DEMO mode can be started from the SETUP menu as
described in the following section.

Split Screen Displays

The Probe has several different split screen display capabilities
such as Split Screen Zoom, Split Screen Chart and Forward
Scan, Split Screen Chart and Track Plot, among others. It is
important to realize that whatever is displayed on the right side
of the display is the PRIMARY information. This means that
when you are in split screen displays, the softkey menus will
usually only relate to the right side of the display.

For example, when you are in the split screen Chart/Track
Plotter display, the Track Plot will appear on the right side of
the display and the softkey menu will allow you to change the

20

Track Plotter settings. In order to make changes to the
downlooking Chart display, you must go to a display where the
Chart display is on the right side of the display (such as the
Chart mode).

In addition to the fact that the softkey menu typically relates to
only the right side of the split screen displays, other features
such as Bottom Hardness and Fish Symbols will not appear in
Zoomed, Bottom Track or Bottom Locked displays.

Cone Angle & Area Covered to Side

The Probe’s Cone Angle is approximately 12 degrees. The
Chart at right shows the approximate width of the cone at
different distances from the boat. Although 50% of the
acoustic radiation is concentrated within this cone, 50% is also
outside the cone which permits the Probe to detect targets
typically up to twice the cone angle, (i.e. 24 degrees). This
means, for example, that at 1,000 feet the Probe will typically
be able to see targets across a 420 foot width (210 feet each
side of center). See Figure at right. To estimate the diameter
of the 12 degree cone, divide the forward range by 5.
Example: At 100 feet forward of the transducer, the 12 degee
cone is approximately 20 feet in diameter.

In Split Screen Views, the Softkey Menu

Relates to the Right Side of the Display

1000

12 Degree
Cone
Angle

750

210

158

500

105

250

53

Distance
Forward

or Below

Boat

Width of 12 Degree Acoustic Beam

Probe can
typically
see targets
within this
area.

21

Display Unit

12 VDC

Power

Cable

Display

Mounting

Bracket

Transom Mounted Transducer

or

Thru-Hull Transducer

Mounting

Knobs

Getting Started

Check to see that all the components shown at left were
included with your Probe. If a part is missing, contact the
Interphase Customer Service Department [phone]
immediately.

WARNING: DO NOT operate the Probe with parts missing
or with parts other than those obtained through Interphase;
doing so could cause a malfunction in the unit. Any
malfunctions to the Probe resulting from unauthorized parts
are not covered by warranty.

Turning the Probe On

To turn the Probe on, press the Power/ Backlight Key located
on the lower right corner of the unit one time. The unit should
sound a beep and the display should be illuminated.

The Control Center

From the Contol Center the Contrast can be adjusted by
turning the Control Knob cockwise to darken, counter
clockwise to lighten. Seven of the most popular displays have
been pre-programmed into the Probe’s memory and can be
instantly selected from the Control Center Menu. In the
following sections, these different displays are called “Views”.
They include:

♦

Full Screen Forward View

♦

Full Screen Track Plot View

♦

Full Screen Chart (Conventional) View

♦

Full Screen Set-Up View

♦

Split Screen Data View with Large Digits on left and
Forward looking display on right.

♦

Split Screen View with Chart (Conventional) display on
left and Forward looking display on right.

♦

Split Screen View with Chart (Conventional) display on
left and Track Plot display on right.

Each of these views can be easily selected by pressing the
button below the desired menu selection. Where two
selections are possible, press the button again until you see
your desired view. When first turned on, the Probe’s internal
memory automatically sets the starting view to the last one you
used before turning off the power.

The flow chart diagram on the facing page shows how to easily
navigate between the Probe’s instant Views.

22

PLOT View (Track Plot)

FWD View (Forward Scan)

DATA View (Large Digits)

CHART/PLOT View

CHART View (Conventional)

SET-UP View (Languages, etc.)

23

CHART/SCAN View

Set-Up View

The Probe includes a SET-UP View where the DEMO
program can be activated, the units of measure and
language can be selected. The display contrast can be
adjusted by turning the front panel rotating knob. The
Probe's internal backup battery will remember all settings
for future use.

From the Control Center press the button below the

SET-UP soft key twice to put the display into the SET­UP View. Then press the button below the “GO” soft key

to use this view. The display should appear as on the
right.

Demo Program

We highly recommend you initially operate the Probe in
the DEMO mode to familiarize yourself with the many
advanced features of the Probe. When using the SET-UP
view, press and hold the soft key below DEMO until the
unit beeps twice and the word “DEMO” on the display
changes to reverse video as shown at left. This will
activate the simulation program. The unit will
automatically cycle through a simulated demonstration of
its many features. At any time, you can press any key to
gain control of the DEMO program to make your own
selections and adjustments. If you do not press any button
for about 45 seconds, the unit will automatically resume
cycling through the different demo features on its own.

The pictures shown in the DEMO mode are
representations of what you might see on your Probe. In
actual use the picture you will get can vary significantly
depending on depth, bottom and water conditions, the
speed of your boat and many other factors (see
Interpreting The Probe’s Forward Display, page 44).

To exit the DEMO program either turn the Probe off and
back on again, or press the “DEMO” soft key again.

Select Units of Measure

The Probe starts with the last units of measure selected.
By pressing the button indicated on the display, you can
use the large front panel knob labeled “BEAM” to choose
between U.S., Nautical and Metric units. Rotate the front
panel knob to select (highlight) the type of display units
desired. Once selected, press any button to save your
selection and exit. The current choice is displayed each
time the “UNITS” soft key is pressed.

24

The choices and their settings are as follows:

Feature U.S. Nautical Metric

Depth/Range Feet Fathoms Meters
(Ft.) (Fa) (M)
Water Temp F F C
(ºF) (ºF) (ºC)
Boat Speed Mi./Hr. Knots Knots
(MPH) (KT) (KT)
Distance Log Miles Naut. Mi Naut.Mi
(Mi) (NMi) (NMi)
Nav. Track Plot Miles Naut. Mi Naut.Mi
(Mi) (NMi) (NMi)

Select Menu Language

The Probe allows the selection of 9 operating languages;
English, French, Italian, Spanish, German, Danish,
Finnish, Swedish and Greek may be chosen. To select the
operating language, press the button labeled LANG. A
display window as shown at right will pop up on the
screen showing the available languages and the one
currently selected. Use the large front panel knob labeled
BEAM to change (highlight) the language selection. Once
selected, press any key to save your selection and exit.

Transducer Level Adjustment

The Probe also includes an adjustment to compensate for
transducer installation problems, especially thru-hull
installations, where the transducer is not perfectly vertical
to the water’s surface. This problem can be caused by
improper installation, or by changes in the boats fore/aft
weight.

When the boat is over a known level bottom, the forward
display should show a level line. If the bottom display is
slanted upward or downward (as in the pictures at right),
Press the button labeled LEVEL in the SET-UP View as
shown at right above. In the LEVEL menu, notice the
number which indicates the relative amount of correction
in degrees. It is possible to adjust +/- 15 degrees. Positive
numbers will tend to make the bottom slope upwards and
negative numbers will make the bottom slope downwards.
After making the adjustment, go to the forward display
and verify the correction. Once adjusted, the Probe’s
memory will retain the setting.

A known level
bottom, but
display slopes
upwards. Correct
by adjusting
LEVEL control
in direction of
negative numbers.

A known level
bottom slopes
downwards on
display. Correct
by adjusting
LEVEL control in
direction of
positive numbers.

25

10.3

MPH

Forward View (Full Screen)

While in the Control Center press the leftmost button
labeled "FWD" to view a full screen forward looking
display. At the top left of the screen the current depth
beneath the boat is shown in digital numbers. If the optional
speed/temperature transducer is connected to the unit, the
boat’s speed is displayed just to the left of the digital depth
as shown on the picture at left.

Press the GO button to bring up additional adjustments and
features for this forward looking view. Your display menus
should appear as on the left. Notice that both the
Downward depth and forward ranges are shown by the
digital numbers at the bottom left and the top right side of
the LCD screen. These numbers will change as different
ranges are selected, either automatically or manually.

Range Adjustment

Press the button labeled "RANGE" to bring up the Range
Adjustment soft key menu as shown at left. Press the
button labeled "AUTO" if you would like the Probe’s
internal microprocessor to automatically select and adjust
the range as bottom conditions change. To manually adjust
the range press either the range button labeled "" or "",
or rotate the large knob. If you make a manual depth
adjustment, the AUTO range mode is turned off and will
remain off until the button labeled AUTO is again selected.
Note: when in the AUTO mode, the soft key labeled
AUTO will be shown in reverse video (white on black). To
return to the main forward looking menu, press the left soft
key labeled "LAST".

Sensitivity Adjustment

Press the soft key labeled "SENS" (for sensitivity) to bring
up the choices available for adjusting the Probe's receiver
sensitivity. Press the button labeled "AUTO" so that the
word AUTO is shown in reverse video (white letters on a
black background) if you would like the Probe to
automatically adjust its sensitivity for changing conditions.
To manually adjust the sensitivity, either press the button

labeled “- Sens” or “ Sens +” or rotate the front panel
knob. Note that the soft key shows a number which
indicates the relative sensitivity being used (+1 to +32).
When you choose to manually adjust the sensitivity, the
Probe turns off the AUTO sensitivity mode and it will
remain off until the AUTO soft key is again selected. To
exit the sensitivity menu and save your adjustments simply
press the soft key labeled “LAST” to return to the main
forward looking menu.

26

Alarm Adjustment

In the forward looking display or view, alarms may be set
for targets which are shallower than, deeper than, or within
a specific zone of adjustable depth settings.

To adjust or clear the alarm settings, press the soft key
labeled “ALARM” to bring up the forward looking alarm
menu choices. Pressing the "DEEP" or "SHAL." soft keys
brings up sub-menus to set, adjust or clear the Shallow,
Deep and Zone Alarms. As either the up or down keys are
pressed and held down, or the large knob is rotated, a
vertical bar on the left side of the screen (just below the boat
icon) will move to show the area covered by the depth
alarm. In addition, a horizontal line will appear across the
display. Whenever a solidly displayed target appears at the
same depth as that covered by the alarm bar, the audible
alarm sounds to warn you of underwater targets or changing
bottom conditions. (Note: the horizontal line will disappear
a few seconds after the alarm is adjusted, however, the
vertical bar will remain)

The Shallow Alarm is often used to alert the user to
shallowing bottom conditions and the presence of
underwater targets such as fish, and when activated, will
sound a rapid beeping.

The Deep Alarm is often used in conjunction with the
Shallow Alarm to define a depth range. If the depth
becomes less or greater than the alarm settings, the audio
alarm will sound as a warning. If the Deep alarm is
activated, the Probe will make a slow beeping noise.

A Zone Alarm can be created by using both the Shallow and
Deep Alarms. If the Shallow and the Deep alarm bars on
the left side of the display are “overlapped” (that is the
Shallow Alarm bar overlaps the Deep Alarm bar) a new
Zone Alarm will result and be displayed. When the Zone
Alarm is activated, the Probe will sound a medium speed
beeping.

Press the "CLEAR" soft key to clear the

you previously set. Press "CLEAR"

menu to clear all alarms in this view simultaneously, or
press "CLEAR" in the sub-menus to clear the selected
Shallow or Deep Alarm.

alarm or alarms

in the main alarm

27

RESET
FULL SECTOR
SCAN

RESET
FAR FORWARD
SECTOR SCAN

Beam Sector Width & Steer Adjustment

The large rotary knob labeled “BEAM” can be used to
both adjust the beam scanning sector width and the
direction of the scan. For example, you may not want to
scan the full 90 degree sector from the surface ahead to
beneath the boat, but instead only to scan from the surface
ahead to a certain depth below the surface.

Press the soft key labeled "BEAM" to bring up a sub­menu of beam adjustment choices. By pressing the soft
key labeled "WIDTH", the rotary "BEAM" knob can be
used to adjust the scanning sector width. The actual
sector size will be shown on the display as the BEAM
width is adjusted.

By pressing the soft key labeled “STEER” the resulting
sector can then be steered throughout the possible 90
degree sector (from directly beneath the boat to the
surface ahead).

The RESET button can be used to quickly select three
popular scanning sectors. If the RESET button is pressed
once, the Probe will return to the full 90 degree sector
scan (from straight ahead to below the boat), pressing
RESET again will put the Probe into one of three far
forward sector scans (each sector is approximately 12
degres wide).

The RESET button cycles through the possible scan
sectors as shown at left.

Beam Speed (Resolution)

In its normal scanning mode “NORM”, the Probe will
send out 50 forward beams and will alternate between a
forward beam and the down-looking beam. In the

“FAST” position, only 30 beams will be used and the
Probe will send 5 forward scanning beams for every

down-looking sample, providing maximum scanning
speed with the lowest resolution. In the “DETAIL”
mode, the Probe sends out 90 beams, one every 1 degree
for the maximum resolution, but also at the slowest speed.

28

Plot (Track Plot) View

If your separate Loran C, Decca or GPS receiver has the
proper NMEA 0183 (version 2.0 non-differential) output
capability, or if you own the Interphase Star Pilot GPS,
Pilot GPS or Interphase Pilot Loran, you can easily
interface the unit to the Probe to show both digital and
graphic navigation information. Information obtained
from a navigation receiver can includetrack plotting and
digital Lat/Lon readings. The Probe can also mark
positions with several different graphic symbols. These
functions will not work unless you are able to
successfully interface a navigational instrument such as a
Loran C, Decca or GPS receiver to the Probe.

From the Command Center select the "Plot View" and
press the "GO" soft key to bring up the menu showing the
features and adjustments for this view.

Range

The "RANGE" soft key calls up the sub-menu which lets
you turn on and off an automatic plot ranging function by
pressing the soft key labeled "TRACK". This feature
will, for example, automatically increase the track plot
range if your position goes off the screen. You can
manually adjust the plotter range by using the "RANGE"
up/down soft keys in this sub-menu.

The Track Plot square on the display shows the current
plotter range (1/4, 1/2, 1, 2, 4, 8, 16, 32, 64, 128) in
statute (U.S.) or nautical miles, depending on the units of
measure selected.

Mark

Pressing the "MARK" soft key allows you to mark your
current position on the track plot screen with one of three
graphic icons - an anchor, a fish or a flag. Each icon can
be used up to ten times on a track plot for a total of 30
possible marks. When power is removed from the Probe,
the marks are erased.

29

Center

By pressing the "CENTER" soft key, your current
position will be moved to the center of the track plot
display and the track line dots will be shifted accordingly.

Reset

The "RESET" soft key in the menu restarts your track
plotting by placing your present position in the center of
the track plot screen and erasing all track line dots.

Note: The Probe has both a full screen and a split screen
track plotter. Both of these Views are updated
automatically, regardless of what display screen is in use.
Although these two track plot views are similar, the user
may select different ranges for each of these views. For
example, the full screen track plotter can be set up for a
64 mile range, while the split screen track plotter can be
set up for 1/4 mile! This allows you to get two different
instantaneous views of your boat’s movement by
selecting the two different track plot views. For example,
you could select the range of 64 miles for the full screen
to show far off course changes, but select a range of only
1/4 mile on the split screen track plotter to show more
detail of your boat’s movement.

Track Plotter Symbols

+ Starting Position

W Waypoint selected in
navigation receiver

+ Center of plot screen

30

Chart View

The Probe’s phased array transducer can be electronically
steered to look directly below the boat. In this mode the
Probe LCD display will show a picture like conventional
fixed beam down-looking fish finders. When in this mode,
the Probe offers a full range of sophisticated features which
are found on advanced conventional depth sounders such as
split screen zoom, bottom lock, fish and depth alarms, bottom
hardness (white-line), plus several other features.

From the Command Center select the "CHART" View and
press the "GO" soft key to bring up the menu showing the
features and adjustments for this view. The display should be
similar to that at right.

Range Adjustment

Press the button labeled "RANGE" to bring up the Range
Adjustment soft key menu. Press the button labeled "AUTO"
if you would like the Probe’s internal microprocessor to
automatically select and adjust the depth range as bottom
conditions change. To manually adjust the depth, press either
the range button labeled "" or "". If you make a manual
depth adjustment, the AUTO range mode is turned off and
will remain off until the button labeled AUTO is again
selected. Note: when in the AUTO mode, the soft key
labeled "AUTO" will be shown in reverse video (white on
black). To return to the main forward looking menu, press the
soft key labeled "LAST". (To return to the Control Center
press the soft key labeled "MENU")

Sensitivity Adjustment

Press the soft key labeled "SENS" to bring up the choices
available for adjusting the Probe's receiver sensitivity. Press
the button labeled "AUTO" so that the word AUTO is shown
in reverse video (white letters on a black background) if you
would like the Probe to automatically adjust its sensitivity for
changing conditions. To manually adjust the sensitivity,
press the button labeled “- Sens” or “Sens+” to increase or
decrease the receiver gain. Note that the soft key shows a
number which indicates the relative sensitivity being used (+1
to +32). When you choose to manually adjust the sensitivity,
the Probe turns off the AUTO sensitivity mode and it will
remain off until the AUTO soft key is again selected. Note:
when AUTO mode is turned on the word will be displayed
in reverse video (white letters on a black background). To
exit the sensitivity menu and save your adjustments simply
press the soft key labeled “LAST” to return to the main
forward looking menu.

(Conventional downlooking)

31

Hardness (White-Line)

If the softkey labeled “HARD” is pressed, the display
will show the bottom as a thin line separated by a shaded
area. This mode can be used to find detail close to the
bottom or to indicate the bottom composition. The
thinner the shaded area the softer the bottom. A thick
shaded area indicates a hard or rocky bottom.

Alarm Adjustment

In the forward looking display or view, alarms may be set
for targets which are shallower than, deeper than, or
within a specific zone of adjustable depth settings.

To adjust or clear the alarm settings, press the soft key
labeled “ALARM” to bring up the alarm menu choices.
Pressing the "DEEP" or "SHAL" softkeys brings up sub­menus to set, adjust or clear the alarms. As either the
“” or “” keys are pressed and held down, or the front
panel knob is rotated, a vertical bar on the left side of the
screen (just below the boat icon) shows the area covered
by the depth alarm. Whenever a solidly displayed target
appears at the same depth as that covered by the alarm
bar, the audible alarm sounds to warn you of underwater
targets or changing bottom conditions.

The S

hallow Alarm is often used to alert the user to
shallowing bottom conditions and the presence of
underwater targets such as fish. The Deep Alarm is often
used in conjunction with the Shallow Alarm to define a
depth range. If the depth becomes less or greater than the
alarm settings, the audio alarm will sound as a warning.
A Zone Alarm can be created by using both the Shallow
and Deep Alarms. If the Shallow and the Deep alarm
bars on the left side of the display are “overlapped” (that
is, the Shallow Alarm bar overlaps the Deep Alarm bar) a
new Zone Alarm will result and be displayed.

Pressing the “FISH” softkey activates the fish alarm.
This alarm will activate when the unit detects suspended
returns that it interprets as fish. Press FISH again to
deavtivate the fish alarm. Note: The fish alarm is an
independant alarm and will not be deactivated by
pressing CLEAR as described below.

Press the "CLEAR" softkey to clear the alarm or alarms
you previously set. Press "CLEAR" in the main alarm
menu to clear all alarms simultaneously, or press
"CLEAR" in the sub-menus to clear the selected Shallow
or Deep Alarm.

32

Other Features

Press the soft key labeled "OTHER" to bring up a sub­menu that will allow you to create a split screen zoom or
bottom locked picture, have the Probe interpret the
display and show fish symbols or adjust the display
scrolling speed.

Zoom & Bottom Track & Bottom Lock
(Split Screen displays)

When using the Chart display (conventional down looking
view), the Probe can also display a split screen high
resolution zoom of any 25% of the depth range, or can
show a split screen Bottom Track or Bottom Lock
display. The high resolution Zoom is very useful when
looking for extra detail on the bottom or in areas above the
bottom. Because the Probe uses an Interphase unique
4X over-sampling technique, the zoom actually shows
more data than the non-zoomed picture. Fishermen have
long used the bottom locking features when fishing over a
rocky bottom or when fishing in rough surface conditions.
In the Bottom Track mode, a zoomed view of the bottom
is shown on the left side of the split screen display.
Regardless of changes in bottom depth, the left side tracks
it and keeps the zoomed bottom picture in view. In the
Bottom Lock mode, the bottom is forced to appear as a
straight horizontal line across the bottom of the left side of
the LCD while any targets close to the bottom are
displayed above the bottom line. Over rough bottoms or
in rough conditions, this feature is extremely useful to
eliminate rapidly changing bottom depths from the display
and to show only suspended targets close to the bottom.

Press the soft key labeled "ZOOM " to activate the split
screen high resolution zoom function. The left side of the
LCD screen now shows the zoomed area, while the right
side continues to show the conventional depth display.
Hold down the "ZOOM " soft key (or rotate the front
panel knob) and notice the vertical bar moving downward
in the center of the display which shows the depth area
that is being “zoomed”. By using the "ZOOM " and
"ZOOM " soft keys, you can zoom in on particular
depth areas. The Zoom feature expands any 25% section
of the current depth range on the left half of the screen, or
effectively magnifies the section selected by the zoom bar
by 400%.

Zoom Bar

Split Screen Zoom Display

Split Screen Bottom Tracking Display

33

If you move the zoom bar all the way to the bottom of the
display, the Bottom Track and the Bottom Lock
features can be activated.. When the Bottom Track
feature is activated, the Zoom Bar changes to a thin bar
extending from the top to the bottom of the display.
Pressing the “ZOOM ” button once more activates the
Bottom Lock feature. When in Bottom Lock, the Zoom
Bar changes to a thick vertical line extending from the top
to the bottom of this display. Move the zoom bar up to
return to the regular zoom operation and turn Bottom
Lock off. Moving the zoom bar all the way to the top of
the display turns the Zoom off and returns you to full
screen bottom history.

Split Screen Bottom Lock Display

Zoomed Display with Fish Symbols ON

NOTE: To return to a full screen and exit the
split screen zoom or bottom track mode, you
must carefully move the zoom bar to the top of
the display until it disappears. This can
sometimes be confusing because the Advantage
remembers all settings and will remain in the
split screen zoom or bottom track mode until
you exit this mode as described above.

Fish Symbol (Turn on/off)

Pressing the soft key labeled "FISH" turns the fish
symbol on or off. When turned on, the "FISH" soft key
will be shown in reverse video and the Probe’s
microprocessor will scan the output of the receiver and
looks for specific patterns which it has been programmed
to recognize as fish. If it thinks it “sees” a fish, it creates
a fish symbol in place of the normal blob or arch. Press
the "FISH" soft key to turn this feature off.

Display scrolling speed adjustment

To adjust the speed at which the display scrolls from right
to left, press the softkey labeled either FAST, SLOW or
STOP. The display scrolling rate will change each time
you press this softkey. Faster scrolling rates are generally
used when you want to see the maximum detail possible
while slower speeds are used when you want to slow the
display to show the maximum amount of bottom history.

Screen Scroll Speed

34

Data View

From the Control Center, press the soft key labeled
"DATA" to see a split screen display with large digits on
the left and a forward scanning view on the right. The
large digits show the digital depth and, if your Probe is
equipped with the optional speed/temperature transducer,
the boat speed, surface water temperature, and distance
traveled log.

Range Adjustment

Press the button labeled "RANGE" to bring up the Range
Adjustment soft key menu. Press the button labeled
"AUTO" if you would like the Probe’s internal
microprocessor to automatically select and adjust the
depth range as bottom conditions change. To manually
adjust the depth, press either the range buttons labeled
"" or "" or rotate the front panel knob. If you make a
manual depth adjustment, the AUTO range mode is
turned off and will remain off until the button labeled
AUTO is again selected. Note: when in the AUTO
mode, the soft key labeled "AUTO" will be shown in
reverse video (white on black). To return to the main
forward looking menu, press the soft key labeled LAST.

Log Res. (Distance log reset)

If your Probe is equipped with the optional speed/
temperature transducer, the Probe will automatically keep
a distance traveled log. You can reset this log to zero by
pressing the "Log Res." soft key.

Note: The Probe internal memory keeps the Probe’s
distance log data, even when power is removed. To
zero out the distance log, press the softkey labeled
“Log Res.”.

Sensitivity Adjustment

Press the soft key labeled "SENS." to bring up the choices
available for adjusting the Probe's receiver sensitivity.
Press the button labeled "AUTO" so that the word AUTO
is shown in reverse video (white letters on a black
background) if you would like the Probe to automatically
adjust sensitivity for changing conditions. To manually
adjust the sensitivity press the button labeled “- Sens” or
“Sens.+” to increase or decrease the receiver gain. Note
that the soft key shows a number which indicates the
relative sensitivity being used. When you choose to
manually adjust the sensitivity, the Probe turns off the

35

AUTO sensitivity mode and it will remain off until the
“AUTO” soft key is again selected. Note: when AUTO
mode is turned on the word AUTO will be displayed in
reverse video (white letters on a black background). To
exit the sensitivity menu and save your adjustments
simply press the soft key labeled “LAST” to return to the
main forward looking menu. (Press "MENU" to then
return to the Control Center).

Alarm Adjustment

In the forward looking display or view, alarms may be set
for targets which are shallower than, deeper than, or
within a specific zone of adjustable depth settings.

To adjust or clear the alarm settings, press the soft key
labeled “ALARM” to bring up the forward looking
Alarm menu choices. Pressing the "Deep" or "Shal." soft
keys brings up sub-menus to set, adjust or clear the
Shallow, Deep and Zone Alarms. As the up or down keys
are pressed and held down, a vertical bar on the left side
of the screen (just below the boat icon) shows the area
covered by the depth alarm with a horizontal line.
Whenever a solidly displayed target appears at the same
depth as that covered by the alarm bar, the audible alarm
sounds to warn you of underwater targets or changing
bottom conditions.

The Shallow Alarm is often used to alert the user to
shallowing bottom conditions and the presence of
underwater targets such as fish. The Deep Alarm is often
used in conjunction with the Shallow Alarm to define a
depth range. If the depth becomes less or greater than the
alarm settings, the audio alarm will sound as a warning.
A Zone Alarm can be created by using both the Shallow
and Deep Alarms. If the Shallow and the Deep alarm
bars on the left side of the display are “overlapped” (that
is the Shallow Alarm bar overlaps the Deep Alarm bar) a
new Zone Alarm will result and be displayed.

Press the "CLEAR" soft key to clear the alarm or alarms
you previously set. Press "CLEAR" in the main alarm
menu to clear all alarms simultaneously, or press
"CLEAR" in the sub-menus to clear the selected Shallow
or Deep Alarm.

36

Beam Sector Width & Steer Adjustment

The large rotary knob labeled “BEAM” can be used to
both adjust the beam scanning width and the direction of
the scan. For example, you may not want to scan the full
90 degree sector from the surface ahead to beneath the
boat, but instead only to scan from the surface ahead to a
certain depth below the surface. Press the soft key
labeled "BEAM" to bring up a sub-menu of beam
adjustment choices.

By pressing the soft key labeled "WIDTH", the rotary
BEAM knob can be used to adjust the scanning sector
width. The actual sector size will be shown on the
display as the BEAM width is adjusted.

By pressing the soft key labeled “STEER”, the resulting
sector can then be steered throughout the possible 90
degree sector (from directly beneath the boat to the
surface ahead).

The “RESET” button can be used to quickly select three
popular scanning sectors. If the “RESET” button is
pressed once, the Probe will return to the full 90 degree
sector scan (from straight ahead to below the boat),
pressing “RESET” again will put the Probe into a far
forward scan and pressing it a third time will set select
another far forward scan. Each of the far forward scans
is approximately 12 degrees wide.

The “RESET” button cycles through the three possible
scan sectors, as shown at right.

Beam Speed (Resolution)

In it’s normal scanning mode “NORM”, the Probe will
send out 50 forward beams and will alternate between a
forward beam and the down-looking beam. In the

“FAST” position, only 30 beams will be used and the
Probe will send 5 forward scanning beams for every
down-looking sample. In the “DETAIL” mode, the
Probe sends out 90 beams, one every 1 degree for the

maximum resolution, but also at the slowest speed.

RESET
(Full Sector
Scans))

RESET
(Far Forward
Sector Scans)

37

Chart/Plot View

In this view, the Probe shows a split screen display with a
conventional down looking depth sounder picture on the
left and a track plot display on the right. Pressing the
"GO" soft key will bring up a sub-menu to allow
adjustments to the track plotter display. Adjustments to
the left side of the display (down looking depth display)
are not possible in this view. To make adjustments to the
depth ranges, alarms, etc., go to the CHART view.

From the Command Center select the PLOT/CHART
view and press the "GO" soft key to bring up the menu
showing the features and adjustments for this view.

(split screen)

Range

The "RANGE" soft key calls up the sub-menu which lets
you turn on and off an automatic plot ranging function by
pressing the soft key labeled "TRACK". This feature
will, for example, automatically increase the track plot
range if your position goes off the screen. You can
manually adjust the plotter range by using the Range up/
down soft keys in this sub-menu.

The Track Plot square on the display shows the current
plotter range (1/4, 1/2, 1, 2, 4, 8, 16, 32, 64, 128) in
statute (U.S.) or nautical miles depending on your units of
measure selected.

Mark

Pressing the "MARK" soft key allows you to mark your
current position on the track plot screen with one of three
graphic icons - an anchor, a fish or a flag. You may use
each icon up to ten times on a track plot for a total of up
to 30 possible marks.

Note: Marks are not stored in memory. All marks
are removed when unit is powered off.

38

Center

B

position will be moved to the center of the track plot
display and the track line dots will be shifted accordingly.

Reset

The "RESET" soft key in the menu restarts your track
plotting by placing your present position in the center of
the track plot screen and erasing all track line dots

Note: All other past information, including track line
dots and marks, will be lost when you Reset the Track
Plot.

y pressing the "CENTER" soft key, your current

Note: The Probe has both a full screen and a split screen

track plotter. Both of these Views are updated
automatically regardless of what display screen is in use.
Although these two track plot views are similar, the user
may select different ranges for each of these views. For
example, the full screen track plotter can be set up for a
64 mile range, while the split screen track plotter can be
set up for 1/4 mile! This allows you to get two different
views of your boat’s movement by selecting the two
different track plot views. For example, you could select
the range of 64 miles for the full screen to show far off
waypoints, etc.; but select a range of only 1/4 mile on the
split screen track plotter to show more detail of your
boat’s movement.

Track Plotter Symbols

+ Starting Position

W Way point selected in
navigation receiver

+ Center of plot screen

39

Chart/Scan View

In this split screen view, the Probe shows a forward
looking view on the right and a conventional down
looking chart view on the left. In this view, adjustments
can be made to the right side of the display (forward
looking view) but not to the left side (conventional down
looking display). To make adjustments to the down
looking alarms, etc., go to the CHART view.

Range Adjustment

Press the button labeled "RANGE" to bring up the Range
Adjustment soft key menu. Press the button labeled
"AUTO" if you would like the Probe’s internal
microprocessor to automatically select and adjust the
depth and forward range as bottom conditions change. To
manually adjust the depth and forward range, press either
the range button labeled "" or "". If you make a
manual adjustment, the AUTO range mode is turned off
and will remain off until the softkey labeled “AUTO” is
again selected. Note: when in the AUTO mode, the soft­key labeled “AUTO” will be shown in reverse video
(white on black). To return to the
menu, press the soft key labeled "LAST".

(split screen)

main

forward looking

Sensitivity Adjustment

Press the soft key labeled "SENS." to bring up the choices
available for adjusting the Probe's receiver sensitivity.
Press the button labeled "AUTO" so that the word
AUTO is shown in reverse video (white letters on a black
background) if you would like the Probe to automatically
adjust its sensitivity for changing conditions. To
manually adjust the sensitivity press the button labeled “­Sens” or “Sens.+” to increase or decrease the receiver
sensitivity. Note that the soft key shows a number which
indicates the relative sensitivity being used. When you
choose to manually adjust the sensitivity, the Probe turns
off the AUTO sensitivity mode and it will remain off
until the “AUTO” soft key is again selected.

Note: when AUTO mode is turned on the word
AUTO will be displayed in reverse video (white letters
on a black background).

40

Alarm Adjustment

In the forward looking display or view, alarms may be set
for targets which are shallower than, deeper than, or
within a specific zone of adjustable depth settings.

To adjust or clear the alarm settings, press the soft key
labeled “ALARM” to bring up the forward looking
Alarm menu choices. Pressing the "DEEP" or "SHAL."
soft keys brings up sub-menus to set, adjust or clear the
Shallow, Deep and Zone Alarms. As the up or down
keys are pressed and held down, a vertical bar on the left
side of the screen (just below the boat icon) shows the
area covered by the depth alarm. Whenever a solidly
displayed target appears at the same depth as that covered
by the alarm bar, the audible alarm sounds to warn you of
underwater targets or changing bottom conditions.

The Shallow Alarm is often used to alert the user to
shallowing bottom conditions and the presence of
underwater targets such as fish. The Deep Alarm is often
used in conjunction with the Shallow Alarm to define a
depth range. If the depth becomes less or greater than the
alarm settings, the audio alarm will sound as a warning.
A Zone Alarm can be created by using both the Shallow
and Deep Alarms. If the Shallow and the Deep alarm bars
on the left side of the display are “overlapped” (that is, the
Shallow Alarm bar overlaps the Deep Alarm bar) a new
Zone Alarm will result and be displayed.

Press the "CLEAR" soft key to clear the alarm or alarms
you previously set. Press "CLEAR" in the main alarm
menu to clear all alarms simultaneously, or press
"CLEAR" in any of the sub-menus to clear the selected
Shallow or Deep Alarm.

41

RESET
(Full Sector Scan)

RESET
(Far Forward
Sector Scans)

Beam Sector Width & Steer Adjustment

The large rotary knob labeled “BEAM” can be used to
both adjust the beam scanning width and the direction of
the scan. For example, you may not want to scan the full
90 degree sector from the surface ahead to beneath the
boat, but instead only to scan from the surface ahead to a
certain depth below the surface.

Press the soft key labeled “BEAM” to bring up a sub­menu of beam adjustment choices.

By pressing the soft key labeled "WIDTH", the rotary
"BEAM" knob can be used to

adjust the scanning

sector width. The actual sector size will be shown
on the display as the BEAM width is adjusted.

By pressing the soft key labeled “STEER”, the resulting
sector can then be steered throughout the possible 90
degree sector (from directly beneath the boat to the
surface ahead).

The “RESET” button can be used to quickly select three
popular scanning sectors. If the “RESET” button is
pressed once, the Probe will return to the full 90 degree
sector scan (from straight ahead to below the boat),
pressing “RESET” again will put the Probe into a far
forward scan and pressing it a third time will set select
another far forward scan. Each of the far forward scans is
approximately 12 degrees wide.

The “RESET” button cycles through the three possible
scan sectors, as shown at left.

Beam Speed (Resolution)

In it’s normal scanning mode “NORM”, the Probe will
send out 50 forward beams and will alternate between a
forward beam and the down-looking beam. In the

“FAST” position, only 30 beams will be used and the
Probe will send 5 forward scanning beams for every
down-looking sample. In the “DETAIL” mode, the
Probe sends out 90 beams, one every 1 degree for the

maximum resolution, but also at the slowest speed.

42

NMEA 0183 Interface

The Probe will accept navigation data from some Loran C,
Decca, and GPS receivers in the NMEA 0183 data format.
This interface has been tested and is verified to work with the
Interphase Pilot GPS. It features a unique, fully dedicated
microprocessor for the NMEA 0183 data port which provides
maximum compatibility among Loran C, Decca and GPS
receivers.

If your equipment conforms to the following NMEA 0183
Version 2.0 non-differential interface protocols, the Probe is
probably compatible- BOD, GLL, IMA, WDR, BPI, BWR,
BWC, BER, BEC, GXP, GDP, GOP, GLP, GGA, RMA,
RMB, RMC. Consult your operation manuals or contact the
manufacturer for further information on interfacing.

The Probe needs to be interfaced via the three pin jack on the
rear panel of the display unit. The pin connections are shown
at right. If using a GPS, make sure it is set to send NMEA

0183.

Interphase offers a 5-foot long interconnection cable and a
10-foot interconnect extension cable.

For reference, the internal circuity for the Probe’s NMEA
input is shown below. This technical information may be
helpful if you have difficulty with the NMEA connections.

View from front
of the female
plug

Data In
(high)
(pos)

5’ Interconnect Cable

Data Return

(low)
(neg)

No connection

OUTPUT

+5 V

10K

4N26

1M

Rear Panel 3-Pin NMEA Jack

510

DATA+

DATA-

510

1

2

Probe’s NMEA Input Circuit Showing Protective

Opto-Isolator (4N26)

Part Number 04-1038-000

10’ Interconnect Extension Cable

3

Part Number 04-0006-008

43

Strong Return from
Up-sloping Bottom

Weak Return From Far-Forward

Strong Return from Wall Far-Forward

Interpreting The Probe’s Forward
Display

The Interphase Probe provides a display which shows
acoustic echo returns from the underwater area beneath
and ahead of the vessel. The Phased Array Transducer
steers an acoustic beam over an arc which can be adjusted
from approximately 12 to 90 degrees. As the Probe
steers the beam to different positions, it transmits a pulse
of energy and then waits a defined period of time
(depending on the range selected) to receive any return
echoes. As the energy from this acoustic beam strikes
underwater objects or the bottom, a small portion of the
energy is reflected as an echo back to the transducer.
When the echo is received at the transducer, it is
converted into a small electrical signal and processed for
display on the Probe’s LCD.

Since the Probe knows the direction in which it sent the
transmit pulse and the time it took to receive the return
echo, it can determine the location of the object or bottom
that created the return echo. As the Probe sequentially
steps the acoustic beam from the bottom to the area ahead
of the vessel, the LCD display shows a continuously
updated display of the return echoes in their approximate
position in relation to the vessel.

Because the LCD display is only showing the acoustic
echoes that are returned to the transducer, it can not show
forward bottom conditions that are hidden from its field
of view or are hidden due to obstructions in the acoustic
beam’s path through the water. In addition, smooth
bottom conditions far forward of the vessel are difficult to
see as very little of the acoustic energy is reflected back
as an echo. See the sketch at right.

Bottoms that are rough and rocky or are sloping upwards
will reflect more acoustic energy back to the transducer
and will show up better far-forward of the vessel than
bottoms that are very smooth or slope downward.
However, even though the bottom may be smooth and
does not show up far forward, large obstructions (sea
wall, large rocks, underwater shelves, etc.) will typically
send back strong echoes that can be seen far forward, as
the sketch at left indicates.

44

Distance Forward

Under typical conditions, the Probe will show level or
shallowing bottom contours for a distance forward of between
4X to 6X the depth below the transducer. Obstructions in the
water, such as walls, mud banks, etc. may be seen at much
greater distances, subject to the depth below the transducer
and the 1,200 ft. maximum forward range.

Besides the bottom conditions, water conditions will also
affect the Probe’s performance. For example, surface chop,
temperature inversion layers (thermoclines) and muddy water
may degrade performance.

Noise and Sensitivity Adjustments

The Probe features an AUTO sensitivity feature where it
continuously adjusts the sensitivity to achieve the optimum
picture quality. The sensitivity can also be adjusted manually
to allow for a reduction in sensitivity to minimize the effect of
screen noise, or to increase the sensitivity to show weaker
targets.

In the forward scanning modes, the sensitivity setting is
especially important as too little sensitivity will cause a loss
of far forward bottom readings and too much sensitivity will
cause an increase in screen noise and a possible display of
unwanted transducer sidelobe readings.

Transducer Sidelobe Effect

The Probe’s transducer, like all acoustic transducers, does not
form a perfect beam of acoustic energy. Some of the acoustic
energy is contained in an area called the sidelobes. In
conventional downlooking depthsounders, the sidelobes
create little problem except to distort the size of the actual
beam angle; however, in scanning sonars they can create
echoes that are not placed on the LCD screen in their proper
position (also known as false echoes).

As the Probe sends off its acoustic beam in a specific
direction, it assumes that any return echoes are within the
main beam. However, if the sidelobe energy (which is not
within the main beam) strikes a large object (i.e. the bottom)
and creates a strong return echo, the Probe has no way of
knowing that this “false” echo was not created by the main
beam and will go ahead and show it on the display as if it was
located within the main beam. The most typical display of the
sidelobe echoes appears as an arc at the same distance as the
bottom depth , and in the worst case, from the bottom below
to the surface ahead. After using the Probe in different
situations, with different gain settings, you should become
proficient in identifying the bottom echoes caused by the
transducer’s sidelobes.

Display Depicting Forward Range

Approximately 5 X Current Depth

Display Depicting Forward

Range Approximately 6X

Depth

Transducer

Sidelobes

Main Beam

Sidelobe

Main Beam

False
Echoes

45

To minimize the sidelobe effect, the gain should be

Receiver Output Signals

reduced.

However, in some situations, you may want to ignore the
sidelobe effect and increase the gain to achieve a better
display of the bottom far-forward of the vessel.

TVG (Time Variable Gain)

As the acoustic signal travels through the water it is
attenuated in strength and also loses strength because the
signal is being spread over a larger and larger area. For
this reason, distant targets appear weaker than close
targets - even if both targets are of identical size.

The Probe’s receiver circuit includes a Time Variable
Gain (TVG) feature where the receiver’s gain is
controlled by the microprocessor and increases in value as
the depth or forward range increases. This feature tends
to compensate for the weakening of the signal at large
distances as the receiver’s gain will be increased as the
signal gets smaller. It is also helpful in minimizing
sidelobe problems as shown in the diagram at right.

In the sketch, a boat is shown with the main transducer
beam aimed far forward. However, the sidelobe beam is
also striking the shallow bottom directly beneath the boat.
Both the desired echo (the one from the far forward
beam) and the sidelobe echo will reach the receiver as
shown in the graph just beneath the boat. Note that the
transmit signal, the sidelobe echo and the desired echo
have been arbitrarily shown as the same size.

The diagram just below shows how the TVG on the
receiver changes with distance (or time). The farther the
target from the boat, the larger the receiver gain. Finally,
the bottom diagram shows the output of the receiver after
amplification with the TVG feature. Note that the TVG
has reduced the sidelobe echo compared to the desired
echo.

“False” Bottom
Echoes Caused by
Sidelobe Returns.

Sidelobe Echo Desired EchoTransmit Pulse

Receiver Input Signals

Receiver Gain Level

Receiver Gain (TVG)

Desired Echo

Sidelobe Echo

How Time Varible Gain Helps Reduce Sidelobe

Effects

46

Reference Information

Phased Array Technology

Most existing depthsounders and fishfinders in the marine
market use a mature “fixed beam” technology which was
originally developed during W.W. II to detect the
presence and distance of submarines. Products using this
technology usually have a transducer mounted on the rear
of the vessel, making contact with the water. The
transducer is connected to an electronic display module
which is typically mounted near the boat’s steering
station.

These transducers are typically made up of a
piezoceramic element which is encapsulated in a
hydrodynamically shaped plastic or bronze case. The
piezoceramic element has the important property in that it
will vibrate when shocked with a high voltage electrical
signal and will itself give off a small electrical signal
when physically vibrated. If the display unit sends a large
pulse of voltage down the cable to the transducer, the
transducer will vibrate and the resulting acoustic
vibrations will travel through the water until they strike an
object, such as the bottom or suspended fish. When
striking an object, a small amount of the acoustic energy
is reflected and this “echo” returns and causes a small
vibration in the transducer. The small vibrations in the
transducer caused by the returning acoustic echo cause
the transducer to send a small electrical signal back up the
cable to the display unit. The user can then view the
presence of, and distance to, these underwater objects.

The transducer element, depending on the physical
characteristics of the piezoceramic element (thickness,
diameter, etc.) has a fixed direction in which it is most
efficient at sending and receiving acoustic signals. This
direction is called the “beam angle” and is of critical
concern to most knowledgeable fishermen, as the display
will typically show only those targets that are within this
beam angle. A large beam angle will show targets from a
larger underwater area, but suffers from lack of
resolution. That means that although several targets may
be in the beam angle, the user can only determine their
distance from the transducer, not their lateral position
within the beam. For example, if one fish target is 10’
below the boat at the far right edge of the beam angle, it
will show the same display as if it were 10’ below the
boat at the far left edge of the beam angle. In addition, if
fish are present at exactly the same depth but at different
sides of the underwater beam, the transducer will receive

Cable

Display

Transducer
Housing

Ceramic Element

Acoustic Beam

Echo
Bottom

Beam
Angle

Two Objects
at Same
Depth Will
Appear as
One Object

47

echoes from both fish targets at the same time and the
display will only show a single target. This is a serious
limitation to the conventional technology.

To get around this limitation, several manufacturers have
resorted to adding more piezoceramic elements to the
transducer, each pointed in a different direction. By
selectively using each piezoceramic element the
transducer has the ability to point or look in as many
different directions as there are piezoceramic elements.
After approximately four elements, however, the
transducer housing starts to become physically large and
cumbersome. To date, manufacturers have put as many
as five separate elements into the transducer to enable
users a view in up to five different underwater directions.
In the future, Interphase believes that this multiple fixed­beam approach has serious limitations, especially for use
in more adva ced products where maximum underwater
coverage and resolution are important.

Development of New Technology

To get around these limitations and provide a sonar
system that can achieve both outstanding coverage and
good resolution, Interphase pioneered the use of
Ultrasonic Phased Array Technology. In 1991 we
received the prestigious IMTEC Innovation Award in
recognition of the importance of this new technology to
the marine industry. Although new to the sportsfishing
and recreational marine industry, “phased array
ultrasound technology” has proven its capabilities in the
medical industry for many years. The amazing video
images provided by medical ultrasound equipment are
familiar to most people and clearly demonstrate the
technology’s ability to show highly defined images in a
real-time or live-action mode. Interphase has taken this
same technology and modified it for use in the marine
market.

An acoustic phased array is a group of piezoceramic
elements that are precisely sized and spaced. Each
element will send and receive acoustic pulses as when
used in the conventional single element technology.
However, when all the elements in the array are sending
or receiving acoustic energy at the same time, the entire
array behaves like a single larger element with one
important difference: the ability for the array to
concentrate its acoustic energy in different directions
depending on the different “phasing” of the signals
applied or received by each element. Depending on the
signal phasing to the array, acoustic beams can be
directed in an almost unlimited number of directions. For

Three Fixed-Beam System, Looking Down and

to Each Side of Boat

Bottom

12º Acoustic Beam Can
Be Steered In Any
Direction Over a 90
Degree Arc.

8 Element
Ceramic
Phased
Array

48

example, using an 8 element phased array, the Probe is
capable of steering the acoustic beam in over 90 different
directions. Conventional fixed-beam technology would have
required the use of at least 90 transducer elements, each
pointed in a different direction. Such a transducer would be
much too costly and bulky to be of any practical use in the
marine market.

Since the acoustic beam in the phased array is steered
electronically, requiring no moving parts, it can be quickly and
reliably scanned and re-scanned over a large area. When
displayed, the changing information between subsequent scans
takes on an almost animated quality - showing, for example,
the movement of underwater fish or the constantly changing
bottom conditions.

In addition to its ability to electronically steer an acoustic
beam, the phased array has other advantages over fixed beam
technologies such as: allowing the user to adjust the transducer
beam width, to scan large areas limited only by the physics of
speed of sound through water (5,000 ft/sec.), and the ability to
provide nearly real-time or live-action underwater views.

49

FREQUENTLY ASKED
QUESTIONS

What is the difference between the Probe and Sea
Scout?

The Probe and Sea Scout scan forward of the boat, but
sweep a single beam (12 degree cone angle) in different
directions. The Probe beam sweeps vertically, from the
surface to the bottom (directly under the boat). The Sea
Scout sweeps the 12degree beam from side to side (45
left to 45 right).

Imagine swinging your arm from straight down by your
side, then up pointing at the horizon. You have just
imitated the Probe sweeping pattern.

Now, instead of sweeping your arm up and down, point
your arm at the ground about 12 feet in front of you. Now
sweep your arm from right to left at the same slight
downward angle. You have just imitated the sweeping
pattern of the Sea Scout! The Sea Scout beam angles
down about 20 from the transducer (about 30 feet deep
for each 100 feet of range).

The Probe display will show both bottom and suspended
targets directly in front of the boat. You simply point the
boat where you want to see. The display will show any
targets distance and depth.

The Sea Scout will display suspended targets only, but
will tell you their direction from your boat and their
distance from you. You must estimate the depth of any
targets ahead.

Which one of the products do I need?

For suspended targets ahead (bait fish, salmon, albacore,
etc.) your product is the Sea Scout.
For both suspended targets and a view of the bottom
ahead (collision avoidance, scuba, bottom fish, search/
rescue, ice fishing) you need the Probe.

How wide is the scanning beam?

The phased array scanning beam on all Interphase
scanning sonar operates with a 12 degree cone angle
beam. This means that the diameter of the beam at 100' is
about 15' wide. The transducer operates at
approximately 200 kHz. The beam has many unique
characteristics which allow increased resolution as well
as increased ranges.

How powerful (watts) are the Phased Array Sonar
units from Interphase?

Phased Array Sonar does not operate in the same way
that traditional marine sounders work. Interphase has
combined high-tech software with ultrasound technology
from the medical field and newly released military
ultrasound technology. Interphase's ultrasound
technology is now pending patent approvals. It operates
on approximately 420 watts (RMS tested at the transducer
or 3,200 watts peak to peak) but is channeled through
eight (8) separate elements and the signal is phased via
our software.

IMPORTANT NOTE: All sonar sounders, if more than
200 watts RMS, have a limited use in shallow water (less
than 10' from transducer to bottom). In most cases, the
need to see forward occurs when traveling from deeper to
shallower depths. Forward scanning is possible but
limited when the water is less than 10' deep. Some clutter
on the screen will occur in shallow environments.

What type of transducer is needed and what does it
look like?

The transducers for both Probe and Sea Scout are
available in transom or thru-hull configurations. If you
are operating an inboard, you must use the thru-hull.
Remember that you are measuring ahead from the
transducer, therefore, placing it as far forward as
possible will provide you with greater forward range.

The thru-hull transducers are slightly smaller than a
tennis ball and extremely hydrodynamic (they pass
through water in a streamlined fashion).

50

The transom transducers are mounted on a stainless steel
kick-up bracket in order to minimize the possibility of
damage if striking a floating object. The transom bracket
will 'kick-up' at speeds in excess of 20 knots. Therefore, if
you intend on using the forward scan at high speed, you
will need to consider a thru-hull transducer.

How far ahead will I be able to see?

In most cases, forward scanning with the Probe is
approximately six (6) times farther ahead than the depth
of water. For example, if you are in 15' of water, you can
see about 90' ahead of the transducer. The range is
limited to 1,200' forward and 800' in depth.

Typically, if you are attempting to see great distances
ahead, only targets but not the bottom will appear beyond
300 feet ahead, because a flat bottom with no targets
(rocks, wrecks, fish, etc.) will be stealth or invisible to
sonar pulses at great distances. A rocky bottom or
approaching hazard will normally show up clearly on the
display, even far ahead.

The Sea Scout will provide you with distance and
direction of the targets, but will not provide depth of the
targets, as they may be detected by a pulse that has
actually bounced off of the bottom.

Can I see a regular depth sounder view of the bottom
and scan forward or zoom into the bottom at the same
time?

All Interphase products (TwinScope, Probe, Sea Scout,
Echoscan 8, and Advantage) provide both full screen

views as well as split screens for bottom charting,
forward scanning or zoom view (depending on the unit's
functions), and even Loran/GPS ready track plotting
views.

The most popular display is a split screen with bottom
chart (viewing the bottom as it passes under the boat) and
forward scanning view at the same time. You can
actually see approaching targets and then watch as they
pass under the boat.

Can I see the display in bright sunlight?

The Interphase LCD screen is one of the brightest
displays in the industry. The backlight is a full width,
cold fluorescent tube (reduces the chance of
condensation). In bright sunlight, the LCD screen will
actually show up brighter than in a well lit room. This is
one of the reasons that LCD screens are becoming more
popular in the marine industry.

Also important is the orientation of the display screen.
Notice that the Interphase display screens are wider than
they are tall. This provides a greater viewing area from
side to side, giving you more room for important
information. Many 'other brands' use a vertically
oriented (or tall) display screen which does not allow you
to see as much bottom information at one time. The tall
screen picture disappears faster, and is difficult to read
quickly.

Can I get speed and temperature with my Interphase
Sonar or Fishfinder?

All Interphase products are available with speed and
temperature sensors. A separate transducer is required
for speed and temperature input and display. The speed/
temp transducer is available with either thru-hull or
transom mounting.

It is not necessary to use a thru-hull speed/temp
transducer if the scanning transducer is a thru-hull
mount. Speed and temperature transducers can be placed
on a transom, aft of an inboard engine.

51

Maintenance

The Probe Forward Scanning Sonar has been designed to provide reliable, trouble-free performance for years.
Follow the maintenance tips below to ensure that your Probe remains problem free.

1) Keep your Probe clean and dry. Occasionally wipe unit off with a damp cloth, but be careful not to scratch the
lens covering the LCD screen. For stubborn dirt, use a mild soap and a damp cloth. NEVER USE SOLVENTS
SUCH AS PAINT THINNER, ACETONE, OR GASOLINE TO CLEAN YOUR Probe.

2) Occasionally clean the face of the depth transducer (sensing surface) and carefully remove any marine growth.
Use a mild detergent, or 220 grit sandpaper, or crocus cloth to remove stubborn growth.

3) If the in-line fuse is blown, replace it with a 2 amp fuse. NEVER REPLACE WITH A HIGHER AMP RATING !
If the fuse continues to blow, check the polarity of your 12 VDC power source. If the polarity is correct, check with
the Technical Service Department at [phone].

4) In order to protect your transducer from water damage, paint it with one of the following brands: Interlux­UltraCoat, Fiberglass Bottom Coat, Super Bottom Coat; Pettit-UniPoxy; Rule-Super KL, Gloss Dura Poxy. DO NOT
use a solvent based paint.

5) DO NOT allow any solvents, i.e. gasoline, acetone, to come in contact with the transducer or head unit as
these may dissolve the material.

52

Troubleshooting Guide

If you are experiencing trouble with your Probe, please refer to the following checklist:

PROBLEM SOLUTION

Unit will not turn on. Check fuse, battery voltage and power connections.
Also, check for continuity through the in-line fuse holder.

Unit beeps but no picture appears Check your connections to the battery. Check for
on the screen. corrosion on the battery terminals or on the wiring
connections on a fuse block or buss bar.

Unit blows fuses. Wiring is reversed or there is excessive current from the
battery. The red wire should be “+” (positive) and have
continuity with pin #1 on the female side of the power
supply lead.

Loses picture at speed. Adjust the transducer angle or placement. Make sure that
the transducer is installed in the area which has the least
amount of water turbulence.

LCD darkens in sunlight after Overexposed to sunlight - provide shading for display.
prolonged use.

Screen is full of noise, or has dots Reduce your gain setting and review the section on
running through it. interference.

Bottom slopes up/down Adjust the transducer angle.

Speed display is erratic. Check and clean the impeller wheel and the surrounding
area - be sure the impeller wheel spins freely.

Digital water depth not working. Increase your gain, and check that you are in the proper
depth range.

53

Interference Problems

Interference can come from several sources. The most common of these are:

1) Other nearby depth sounders operating at the same frequency.

2) Radiated interference from the boat’s electrical system (alternator, distributor and spark plugs) or from nearby

equipment that radiates electrical noise.

3) Conducted interference usually occurs when the Probe shares a 12VDC power lead with other noisy equipment
(i.e.; bilge pumps, motors, refrigeration systems, autopilots, etc.)

Interference caused by nearby depth sounders operating on or near the same frequency as the Probe will typically
appear as “rabbit tracks” that march up and down the screen. Reducing the gain will help minimize this problem.

Radiated interference caused by the boat’s engine can usually be identified by observing the Probe with both the
engine running and turned off. If the interference disappears when the engine is turned off, it is safe to assume that
the engine is the source of the interference.

This type of interference can usually be eliminated by using the same techniques used in the automotive industry to
eliminate interference to car radios, CB’s, etc. The following actions may be required:

1) Reduce the Gain setting to minimize interference.

2) Make sure your boat uses resistor type spark plugs and plug wiring.

3) Install a suppressor on the center lead of the distributor.

4) Install an alternator filter to smooth the alternator’s output signal.

Interference may also be caused by radiation from other nearby equipment and can be detected by turning off all other
equipment and observing the Probe display as each suspected source is turned back on. This type of interference can
usually be eliminated by moving the Probe away from the source and checking to ensure that the interfering source is
properly grounded.

Interference causing the display to be unstable, to pulsate or periodically change size is usually caused when another
piece of equipment shares the same 12 VDC power leads from the battery. This problem is especially severe when
equipment requiring large current surges (i.e.; autopilots, refrigerators, or bilge pumps) share the same power leads.
Minimize this type of interference by running the Probe’s 12VDC power leads, or those of the interfering equipment,
directly to the battery.

Alternately, you may find it helpful to install a separate dedicated power supply battery that is used only to run your
electronic gear (e.g.; fishfinders, VHF radios, radar units, etc.). If your unit shuts off during low voltage situations,
such as when cranking your engine starter, you may want to install an isolator switch with an “A/B” type of battery
system. An “A/B” system allows you to run your electronic gear on one battery, while the starter and alternator are
hooked up to the other battery.

Your authorized marine electronics dealer is familiar with the methods of reducing electrical interference and is
qualified to assist you should a problem persist.

54

Specifications

Depth only

Transom Transducer

Part # T1-I200-025

Display Type: 128 x 160 pixels; 20,480 total pixel Super Twist LCD
Depth Ranges: 24 overlapping depth ranges, 0 - 20 to 0 - 800 feet
Forward Ranges: 24 overlapping forward ranges, 0 - 30 to 0 - 1,200 feet

Transmit Frequency: 200 kHz

Depth only

Thru-Hull Transducer

Part # T1-I200-026

12 VDC Power

Supply Cable

Part # 04-0001-008

Zoom Ranges: Variable Zoom allows 25% of depth range to be displayed
across the entire screen.

Pulselength and
Sounding Rates: Automatically optimized for selected range.

Transmitter Power: Over 400 watts RMS (3,200 watts peak to peak)
Surface Water Temperature: With optional speed/temperature upgrade kit installed, display

continuously indicates surface water temperature in tenths of a
degree F from 32.0º to 99.9º F.

Power Requirements: 10.5 to 16 VDC, less than 0.5 Amp.
Dimensions: 7.5”W x 5.5”H x 3.5”D
Standard Equipment: Display unit, 12 VDC power cable with in-line fuse, mounting

bracket with knobs, operation manual and depth transducer w/ 34’
cable.

Specifications subject to change without notice.

55

Factory Reset

Doing a factory reset as described below will return your Probe to the original faxtory settings (range, gain,
display, etc.).

Start with the unit off.

1. Press soft keys #4 and #5 and hold (as labeled in diagram below)

2. Press the #6 key.
The unit will turn on and beep three times, then release the keys. The units logo should appear in the display. This
will reset the unit to it’s ‘factory settings’, please refer to the set-up view portion in the Operations Manual if you
wish to choose a language, select units or modify the level/alignment.

LCD Display

#1

#2 #3 #4 #5 #6

Hold these keys as
power key turned on

SPEED CALIBRATION (Log Adjustment):

To adjust the speed calibration perform the following steps: Select the Data View and then Range option.
Press and hold the Log Res. for three seconds to bring up the log/speed adjustment menu. Use the front panel
knob to adjust the calibration factor. The unit will adjust up to 40% either positive or negative from the factory
settings to compensate for different hull shapes, etc.

TRANSOM MOUNT BRACKETS:

The transom mount scanning sonar transducers now come with a stainless steel ‘kick up’ bracket. In some
manuals the reference pictures for mounting the bracket and transducer may refer to a plastic bracket. The
stainless steel brackets include a spray shield to reduce possible ‘rooster tails’. The spray shield rests between
the transducer tabs in a ‘U’ fashion with the notch facing aft.

Product Support:

Monday thru Friday 8:00 AM 5:00 PM PST Phone: [phone] ext. 16 Fax: [phone]
E-Mail: [email protected]

Power Key

56

How to Obtain Service

If you feel your set is not operating properly, first refer to the sections of this manual on Troubleshooting and
Interference Problems. This information solves the most common problems. If problems persist, please call
Interphase Technical Service at [phone] or send your unit in with the information below filled out.

If you do need to return your set, send it to the following address:

Service Department

Interphase Technologies, Inc.
2880 Research Park Drive, Suite 140
Soquel, CA 95073

In addition, to speed your repair please fill out the following, tear this page out of the manual (or photocopy it), and
tape it to your unit for our technicians to review. For fastest warranty service, include a copy of your purchase receipt
to verify the purchase date.

RETURN TO:

(City) (State) (Zip)

(Your Name)

(Street Address - No P.O. Boxes Please)

Daytime Telephone: ( )
Evening Telephone: ( )

Model: Probe Serial #:

Purchase Date / /

Type of transducer: Transom mount Thru-Hull Other

Please describe the problems you are having with the unit in as much detail as possible in the space below. Please use
another sheet of paper if necessary.

57

NOTES

58

Interphase Technologies, Inc.

5 Year Limited Warranty

Any unit that fails during the first year of the warranty period will, at
Interphase’ option, be repaired or replaced at no charge to the customer
provided it is returned to Interphase, freight prepaid with proof of date of
purchase and a description of the malfunction. Repair or replacement during
the warranty period will not extend the basic warranty period.

From the second through the fifth year, Interphase will, at its option, repair or
replace defective units for a fixed fee. This fee will be set at the beginning of
each year. More information about the fixed rate repair fee is available by
calling Interphase at [phone] or visit our website at
www.interphase-tech.com.

This warranty does not apply to an Interphase product that has failed due to
improper installation, misuse, or accident, nor does it apply to products which
have been repaired or altered outside the Interphase factory.

Transducers, GPS antennas and Radar Antennas are subject to extreme
conditions beyond control of the manufacturer and Interphase. Due to these
conditions, the warranty on these components is limited to one year against
defects in workmanship or materials. The fixed fee for years two through five
of the warranty does not apply to these components. Any costs incurred with
transducer or antenna replacement are specifically excluded from this warranty
other than the cost of the components themselves.

This warranty does not include incidental or consequential damages and
Interphase disclaims any liability for any such damages. All implied
warranties, if any, are limited in duration to the above stated one year warranty
period. Some states and provinces do not allow the exclusion or limitation of
incidental or consequential damages, therefore, the above limitations may not
apply to you.

The completion and return of the enclosed Warranty Registration Card is
a condition precedent to the warranty coverage. Owner must provide
proof of date of purchase in order for warranty to be valid.

This warranty gives you specific legal rights which may vary from state to state
and province to province. This warranty is limited only to the original
purchaser of the unit.

59