Calibrate Speed - Eagle FISHMARK 640C Installation And Operation Instructions Manual

The unit's backlight level can be controlled from the Screen menu.

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.
When you make a run to compare your 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 | |↓ to | .
MENU MENU C W S ENT
ALIBRATE ATER PEED
2. Enter the number you calculated earlier and 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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