JDC Electronic SA Speedwatch User Manual
1. Introducon
Wireless Speed Computer
Instruction manual
The SPEEDWATCH wireless speed computer
is a highly accurate means to measure speed
through water of any low-speed watercraft
such as a sailboat, yacht, kayak or small
powered boats. Designed for the serious racer
and the advanced users, the SPEEDWATCH gives
valuable feedback on the performance of your
watercraft.
The small impeller is placed under the craft, in
a variety of mounting possibilities. When your
boat or kayak is moving through the water,
the impeller rotates creating a magnetic field
that penetrates through hull without wires.
This magnetic field is received by the sensitive
sensor at the end of a cable on the transmitter,
which is placed within 30 cm from the impeller.
The transmitter then sends out a low-frequency
radio signal that is received by the display up to
5 meters. The signal is processed and displayed
as instant speed.
The SPEEDWATCH uses this speed signal to
calculate the instant, balanced, and maximum
speed as well as the trip and total distance. The
SPEEDWATCH outperforms any GPS with regards
to precise speed and distance measurement,
allowing for minute changes in performance to
be registered and adjusted. The SPEEDWATCH
becomes an invaluable tool when sailing or
rowing in currents, as it measures true speed
through water, rather than average speed over
land like a GPS.
The magnetized impeller requires no power
source, the transmitter uses a 9V battery, and
the display includes a long-life Lithium battery,
good for hundreds of hours of use.
FUNCTION
Speed : Instant, balanced, maximum, average
Distance : Trip, total
Chronometer : Automatic or manual
Countdown Timer : 10, 6, 5, 3, or 1 minute(s)
Time of day : AM/PM mode
Backlight : Red backlight
Display - front
Transmitter
Display - back
DISPLAY
a) LCD
b) Backlight button
c) Speed select button
d) Distance select button
e) Chronometer start button
TRANSMITTER
h) 0.3 m cable
i) Sensor for impeller
j) Transmitter body
k) Battery cap
IMPELLER
l) Mounting plate
m) Fin
n) Threaded shaft
o) Threaded base
p) Magnetized impeller
f) Spring snap for mounting plate
g) Battery cover (four screws)
2. Display Screen Descripon
a) Automatic (auto) or manual (man) chronometer, or countdown timer (timer)
b) Chronometer display, hours: minutes’ seconds”
c) Receiving transmission
d) Speed display
e) Speed increase or decrease
f) Units of measure (knots, mph, km/h, ou m/s)
g) Low battery indicator (for display)
h) Trip (TRIP) or total (TOT) distance
i) Distance display
j) Balanced (BAL), maximum (MAX), or average (AVG) speed
Impeller
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3. Start up the Instrument
DISPLAY
From the factory, the SPEEDWATCH is in a low
power state, with the time flashing. Press any
button to enter normal mode.
The SPEEDWATCH is now in Manual Mode;
it will only receive data from the transmitter
when the CHRONO button is pressed and the
impeller is rotating. The default speed is knnots,
which can be changed to mph, km/h, or m/s.
IMPELLER
The SPEEDWATCH impeller needs to be screwed
on to either the white fin mount (1), the large
black fin (2) or the rudder black fin mount
(3). The impeller is magnetized and creates a
magnetic pulse when rotating. This magnetic
pulse is received by the transmitter and
transmitted to the display. The display cannot
sense the impeller directly; the transmitter
must be on.
TRANSMITTER
The SPEEDWATCH Transmitter requires a 9V
battery to operate; this is included in your
system. To install the battery, gently pull the
cap exposing the battery compartment. Install
the 9V battery and replace the battery cap. Be
sure to press the cap back on fully to form the
water tight seal. Failure to do this could result
in the 9V battery failing. The electronics in
the SPEEDWATCH transmitter are completely
factory sealed. Do not attempt to open the case
exposing the electronics, or failure can occur.
It is not necessary to remove the battery except
for long period (winter storage) because the
power consumption is very low if no magnetic
field is received.
Red flashes appear on the bottom side when
the transmitter receives the magnetic signal
from the impeller.
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