Eagle Electronics FishElite 642c - Manual (Page 62)

54
Fish Alarm
Use the fish alarm for a distinctive audible alarm when fish or other
suspended objects are detected by the Fish I.D.
 feature. Fish I.D.
must be turned on for the Fish Alarm to work. A different tone sounds
for each fish symbol size shown on the display.
Sonar Alarms menu with Fish Alarm selected. The check box to the left
is blank, indicating the alarm is turned off.
To turn on the fish alarm:
2. From the Sonar Alarms, press
↓ to
F
ISH
A
LARM
| ENT .
3. To turn off the alarm, highlight F
ISH
A
LARM
and press ENT .
Press EXIT repeatedly to get back to the main page display.
Calibrate Speed
The speed sensor can be calibrated to compensate for inaccuracies. Be-
fore you change the setting, calculate the percentage the speed is off.
You will enter this percentage in a moment.
If you figure the sensor is reading 10 percent faster than actual speed,
you will enter -10 in the calibration window. If the sensor 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 the GPS function. When you
make a run to compare GPS ground speed to speed sensor speed, per-
form your test in relatively calm water free of current, if possible.
1. Press MENU | MENU |
↓ to
S ONAR S ETUP
| ENT |
↓ to
C ALIBRATE W ATER
S
PEED
| ENT .
2. Enter the number you calculated earlier. Press
↑ ↓ to change the
first character (+ or –), then press
→ to move the cursor to the next
number and repeat until the percentage is correct. Press EXIT .