Fish Alarm - Raymarine L750 Operating Handbook

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trigger the alarm, the letter "D" will begin to flash, and the buzzer will
sound. Press the Clear button to silence the buzzer. The letter "D" will
continue to flash until you move into shallower water.
Note: You may want to use both the Shallow Alarm and Deep Alarm
features when you are anchored. Set the limits just a bit to either side of
your anchor depth. When set this way, the unit will trigger an alarm if the
anchor drags and the boat moves into shallower or deeper water.

Fish Alarm

The third Soft Key controls the Fish Alarm feature. This alarm will trigger
when the unit detects a fish. Press the Soft Key again to turn this item on
or off. The fish alarm feature will work even if the fish symbols are turned
off.
When the fish alarm is set, the fish symbol will appear in the upper left-
hand corner of the normal displays. If a fish is detected, the buzzer will
sound. The unit uses different buzzer tones to indicate fish detected by
the 50 kHz and 200 kHz transducers.
Buzzer
The fourth Soft key sets up the Buzzer feature. Press the Soft Key
several times to see the three possible settings. If you choose the
setting labeled Alarms, the buzzer will sound when any of the alarm
conditions occurs (shallow, deep, or fish alarm). When one of the
alarms is tripped, the "S" or "D" symbol at the top of the screen will flash.
By pressing the Clear button, you can silence the buzzer for the current
alarm condition . The "S"or "D" symbol will continue to flash as long as
the alarm condition is still present.
If the alarm condition occurs again, the buzzer will sound again. (For
example, this would happen if, after a shallow alarm you moved into
deep water, then returned to shallow water.) You can silence the buzzer
again by pressing the Clear button.
If you choose the setting for Alarms + Keys, the buzzer will also sound a
short "beep" each time you press one of the buttons on the control panel.
This confirms that you have pressed the button hard enough, and that
the unit has received your command.
L750 Fishfinder: Installation and Operation Handbook