Specifications

Page 3
M
Mode
Button
M
Mode
Button
M
Mode
Button
Down
Button
Up
Button
Speedometer / Depth Sounder
The Serial Bus Speedometer / Depth
Sounder provides both the functions of a
speedometer and a depth sounder. The
analog speedometer is a stepper motor
instrument which looks like a standard
analog device but which is actually a
digital instrument. On small pointer
movements you may occasionally see the
pointer moving in the one third degree
“steps” that represent the accuracy of the
instrument.
Speedometer Calibration
The analog speedometer displays the
speed of the boat through the water. The
speedometer is calibrated at the factory for
normal installations which use a pitot tube
sensor. As significant variation has been
found in various installations, the
speedometer can be easily calibrated to a
known reference such as a radar gun or
GPS. The LCD will display;
When the unit is operating in normal
mode (i.e. pitot status information on the
LCD), push and hold the “mode M” button
down for 2 seconds will cause the
speedometer to go to the calibration mode.
The LCD will show “AdJUST”.
Run the boat at a constant 30 MPH as
measured by the GPS or radar. Adjust the
speedometer pointer by pressing the “Up”
or “Down” buttons until the speedometer
matches the GPS or radar speed.
When finished, press the “mode M” button
to exit the adjustment screen. The operator
has the option of saving or canceling the
adjustment procedure. The options can be
selected using the “Up” or “Down”
buttons. To save the calibration setting,
press and hold the “mode M” button for 2
seconds when the display shows “SAVE”
To exit the adjustment procedure without
saving, press and hold the “mode M”
button for 2 seconds when the display
shows “NO SAVE”. Multiple runs in
opposite directions may be necessary to
compensate for errors due to water
currents.