Calibrating the water speed – Garmin GPSMAP 376C User Manual

Page 117

Calibrating the Water Speed

If you select Temp, Spd for the Transducer option on the Setup sub

tab, you must calibrate the water speed to ensure the Water Speed

shown on your unit is accurate. The calibration should take place in

water having little or no current.
The unit automatically uses the GPS ground speed, if it is available,

for comparison on the calibration. If a GPS ground speed is not

available, use either your boat’s speedometer reading (not always

accurate) or a stopwatch to determine your speed over a certain

distance. To find out your speed, divide the distance by the time.

To calibrate the water speed:

1. On the Setup sub tab, highlight the

Calibrate Water Speed

button, and press

ENTER.

2. Bring the boat to a cruising speed. Both the top ground and

uncalibrated water speeds are shown at the bottom of the

calibration window. Note your top speed, then stop the boat,

and press

ENTER.

NOTE: You must have a transducer with a built-in speed sensor

or seperate compatible speed sensor.

Calibrating the Water Speed

3. By default, the top ground speed is automatically shown. If

a ground speed is not available, the top uncalibrated water

speed is used instead. If the new speed is correct, highlight

OK, and press ENTER.

If you want to manually enter a calibration, press

ENTER

while the speed is highlighted, enter a new speed, and press

ENTER again.

If the boat is not moving fast enough or the speed sensor is not

outputting a speed, “Boat Is Not Moving Fast Enough To Calibrate”

appears at the bottom of the screen. Check that the speed sensor

wheel is moving or safely increase boat speed. If there is a problem

with the speed sensor or if a speed senor is not installed, “Water

Speed Sensor Is Not Working” appears at the bottom of the screen.

Check connections of speed sensor cables.

GPSMAP 376C Owner’s Manual

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