Garmin 340c Manual

A SERVICE OF

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Fishnder 340C Owner’s Manual 

usIng the fIshfInder 340c > usIng the MAIn Menu

• Water Speed—this appears only if you are using

a speed-capable transducer/sensor. Calibration is required

to ensure that the water speed shown on your Fishnder is

accurate. The Fishnder automatically uses GPS ground

speed (if available using NMEA input) 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 (distance / time = speed). It is recommended that the

calibration take place in water having little or no current.

To calibrate the water speed:

1. Use the ROCKER to highlight Calibrate Water Speed,and

press ENTER.

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

speedanduncalibratedwaterspeedappearsatthebottom

ofthecalibrationwindow.Noteyourtopspeed,thenstop

theboat,andpressENTER.

3. Bydefault,thetopspeedautomaticallyappearsintheWhat

was your top water speed?eld.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 on

thespeedeld,enteranewspeed,andpressENTER.

If the boat is not moving fast enough or the speed

sensor is not registering a speed, a “Boat Is Not Moving Fast

Enough To Calibrate” message 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 Fishnder

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

Speed Sensor Is Not Working” message appears at the bottom

of the screen. Check the connections of the speed sensor cables.