Garmin GT51M-THP, GT51M-TM, GT50M-THP, GT50M-TM, GT41-TM Installation Instructions
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Transom-Mount Transducer
Installation Instructions
To obtain the best performance and to avoid damage to your
boat, you must install the Garmin® transducer according to these
instructions.
Read all installation instructions before proceeding with the
installation. If you experience difficulty during the installation,
contact Garmin Product Support.
Registering Your Device
Help us better support you by completing our online registration
today.
• Go to http://my.garmin.com.
• Keep the original sales receipt, or a photocopy, in a safe
place.
Contacting Garmin Product Support
• Go to www.garmin.com/support for in-country support
information.
• In the USA, call 913-397-8200 or 1-800-800-1020.
• In the UK, call 0808 238 0000.
• In Europe, call +44 (0) 870 850 1241.
Important Safety Information
WARNING
See the Important Safety and Product Information guide in the
product box for product warnings and other important
information.
You are responsible for the safe and prudent operation of your
vessel. Sonar is a tool that enhances your awareness of the
water beneath your boat. It does not relieve you of the
responsibility of observing the water around your boat as you
navigate.
CAUTION
Failure to install and maintain this equipment in accordance with
these instructions could result in damage or injury.
Always wear safety goggles, ear protection, and a dust mask
when drilling, cutting, or sanding.
Select Download.
5
If necessary, select Run.
6
If necessary, select the drive associated with the memory
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card, and select Next > Finish.
Updating the Device Software
Before you can update the software, you must obtain a
software-update memory card or load the latest software onto a
memory card.
Turn on the chartplotter.
1
After the home screen appears, insert the memory card into
2
the card slot.
NOTE: In order for the software update instructions to
appear, the device must be fully booted before the card is
inserted.
Follow the on-screen instructions.
3
Wait several minutes while the software update process
4
completes.
The device returns to normal operation after the software
update process is complete.
Remove the memory card.
5
NOTE: If the memory card is removed before the device
restarts fully, the software update is not complete.
Tools Needed
• Drill and drill bits
• Two 13 mm hex wrenches
• Number 2 Phillips screwdriver
• Masking tape
• Marine sealant
About the Transducer
The transducer transmits and receives sound waves through the
water, and relays sound-wave information to your Garmin sonar
device.
Assembling the Transducer with a Transom Mount Bracket
Attach the mount À to the transducer Á with the included
1
8 mm M4 screws Â, and 4 mm star washers Ã.
NOTICE
When drilling or cutting, always check what is on the opposite
side of the surface.
This equipment should be installed by a qualified marine
installer.
Loading the New Software on a Memory Card
You must copy the software update to a memory card using a
computer that is running Windows® software.
NOTE: You can contact Garmin customer support to order a
preloaded software update card if you do not have a computer
with Windows software.
Insert a memory card into the card slot on the computer.
1
Go to www.garmin.com/support/software/marine.html.
2
Select Download next to the software bundle that
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corresponds with your device.
Read and agree to the terms.
4
October 2015
Printed in Taiwan 190-01850-02_0A
Attach the mount to the bracket Ä with the 16 mm M8 bolts
2
, M8 flat washers Æ, and M8 lock nuts Ç.
Å
Installing the Transducer on a Transom
Mounting Location Considerations
• The transducer should be mounted as close to the center of
the boat as possible.
• The transducer should not be mounted behind strakes, struts,
fittings, water intake or discharge ports, or anything that
creates air bubbles or causes the water to become turbulent.
The transducer must be in clean (non-turbulent) water for
optimal performance.
• The transducer should not be mounted in a location where it
might be jarred when launching, hauling, or storing.
• On single-drive boats, the transducer must not be mounted in
the path of the propeller.
The transducer can cause cavitation that can degrade the
performance of the boat and damage the propeller.
• On twin-drive boats, the transducer should be mounted
between the drives, if possible.
Installing the Transom-Mount Hardware
NOTICE
If you are mounting the bracket on fiberglass with screws, it is
recommended to use a countersink bit to drill a clearance
counterbore through only the top gel-coat layer. This will help to
avoid any cracking in the gel-coat layer when the screws are
tightened.
The cables connected to the transducer should not be cut,
because cutting the transducer cables voids your warranty.
Position the transducer mount À so the center of the bottom
1
of the transducer is level with the bottom edge of the transom
and is parallel to the water line.
Align the transducer parallel to the water line Á, and mark the
2
center location of the two outer holes and the center hole of
the transducer mount.
Wrap a piece of tape around a 4 mm (5/32 in.) bit at 15 mm
3
(19/32 in.) from the point of the bit, to avoid drilling the pilot
holes too deep.
If you are installing the bracket on fiberglass, place a piece of
4
tape over the pilot-hole location to reduce cracking of the gel
coat.
Using the 4 mm (5/32 in.) bit, drill the pilot holes approximately
5
15 mm (19/32 in.) deep at the marked locations.
Apply marine sealant to the included 20 mm screws, and
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attach the transducer assembly to the transom.
NOTE: The third screw in the lower center screw hole
stabilizes the mount.
If you must route the cable through the transom, choose a
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pilot-hole location well above the waterline à and mark it.
Place a cable clamp on the transducer cable Ä,
8
approximately one third of the distance between the
transducer and the top of the transom or the pilot hole.
Mark the pilot-hole location for the cable clamp, and using a
9
3.2 mm (1/8 in.) bit, drill a pilot hole approximately 10 mm
(3/8 in.) deep.
Apply marine sealant to the included 12 mm screw, and
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attach the cable clamp to the transom.
Repeat steps 8 through 10 to install the other cable clamp
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approximately two thirds of the distance between the
transducer and the top of the transom or the pilot hole.
If you marked a pilot hole in step 9, choose the appropriate
12
drill bit and drill a pass-through hole completely through the
transom:
• If you have the 4-pin cable, use a 16 mm (5/8 in.) drill bit.
• If you have the 8-pin cable or the 12-pin cable, use a
25 mm (1 in.) drill bit.
Route the transducer cable to the sounder:
13
• If you are routing the cable using a pass-through hole,
feed it through the hole you drilled in step 12, and install
the cable-entry cover à (Installing the Cable-Entry Cover,
page 2).
• If you are not routing the cable using a pass-through hole,
route the cable up and over the top of the transom Å.
Avoid routing the cable close to electrical wires or other
sources of electrical interference.
Installing the Cable-Entry Cover
If you routed the cable through the transom after you installed
the transducer, you should install the cable-entry cover to keep
water from entering your boat.
Place the cable-entry cover À over the hole and the cable,
1
with the opening pointing downward, and mark the location of
the two pilot holes.
Remove the cable-entry cover, and, using a 3.2 mm (1/8 in.)
2
bit, drill the pilot holes approximately 10 mm (3/8 in.) deep.
2 Transom-Mount Transducer Installation Instructions
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