Lowrance electronic LMS-337C DF GPS Receiver User Manual


 
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Sonar Alarms menu with Fish Alarm selected. The check box to the left
is blank, indicating the alarm is turned off.
To turn the fish alarm on:
1. Press MENU|MENU| to ALARMS|ENT| to SONAR ALARMS|ENT.
2. Press to
FISH ALARM|ENT|EXIT|EXIT|EXIT.
3. To turn off the alarm, press
MENU|MENU| to ALARMS|ENT| to
SONAR ALARMS|ENT| to FISH ALARM|ENT|EXIT|EXIT|EXIT.
Calibrate Speed
The speed sensor can be calibrated to compensate for inaccuracies. Be-
fore you change the setting, first calculate the percentage that the
speed is off. You will enter this percentage in a moment.
For example, if you figure the sensor is reading 10 percent faster than
actual speed, you will enter – 10 in the calibration window. If the sen-
sor is reading 5 percent slower than true speed, you will enter + 5 in
the window.
A good way to gauge your speed sensor's performance is to compare its
reading with the ground speed measured by your unit's GPS functions.
When you make a run to compare GPS ground speed to speed sensor
speed, perform your test in relatively calm water free of current, if pos-
sible. (Unless, of course, you are taking the speed of current into con-
sideration when making your calculation.) After you have a correction
figure, here's how to enter it:
1. Press
MENU|MENU| to SONAR SETUP|ENT| to CALIBRATE WATER
SPEED|ENT.
2. Enter the number you calculated earlier: press or to change the
first character (+ or –), then press to move the cursor to the next
number and repeat until the percentage is correct, then press
EXIT.