49
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.
Perform your test in relatively calm water free of current, if possible.
(Unless, of course, you are taking the current speed into consideration
when making your calculation.) After you have a correction figure,
here's how to enter it:
1. Press
MENU
|
MENU
|
↓
to
C
ALIBRATE
W
ATER
S
PEED
|
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
.
Left, Sonar Page menu with Chart Speed command selected.
Right, Chart Speed Control Bar.
Chart Speed
The rate that echoes scroll across the screen is called the chart speed.
The default is maximum; we recommend that you leave the speed set
there for virtually all fishing conditions.
However, you might consider experimenting with chart speed when you
are stationary or drifting very slowly. You may sometimes achieve bet-
ter images as you slow down the chart speed to match how fast you are
moving across the bottom.
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