Lowrance electronic LMS-480M, LMS-480DF manual Calibrate Speed, To turn the fish alarm on

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 MENUMENU↓ to ALARMSENT↓ to SONAR ALARMSENT.

2.Press ↓ to FISH ALARMENTEXITEXITEXIT.

3.To turn off the alarm, press MENUMENU↓ to ALARMSENT↓ to

SONAR ALARMSENT↓ to FISH ALARMENTEXITEXITEXIT.

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 current speed into consid- eration when making your calculation.) After you have a correction fig- ure, here's how to enter it:

1.Press MENUMENU↓ to SONAR SETUPENT↓ to CALIBRATE WATER

SPEEDENT.

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.

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