To turn off the fish alarm without turning off fish symbols, press MENU DOWN until FISH ALARM appears. Press DOWN ARROW to select OFF, then press PWR to clear the menu. Repeat the above steps to turn the alarm back on, but press UP ARROW to select ON before clearing the menu.

Depth Alarms

The depth alarms are triggered only by the bottom signal. No other echoes will activate these alarms. The depth alarms consist of a shallow and a deep alarm. The shallow alarm sounds an alarm tone when the bottom goes shallower than the alarm's setting. The deep alarm sounds a tone when the bottom goes deeper than its setting. Both alarms adjust the same way, although through different menus.

Shallow Alarm

To set the shallow alarm depth, press MENU DOWN repeatedly until SHALLOW ALARM appears.

Press UP ARROW to increase the shallow alarm's depth setting or press DOWN ARROW to decrease it. The number in the shallow alarm’s menu box shows the current shallow

alarm setting. When the number reaches the desired setting, press PWR to clear the menu. When the bottom depth goes shallower than the alarm’s setting, an alarm tone sounds and a message box appears on the screen.

Press PWR to silence the alarm. This turns the alarm sound off until the shallow alarm is triggered again.

To turn the alarm off, press MENU DOWN repeatedly until SHALLOW ALARM appears. Press DOWN ARROW until the words OFF FEET appear, then press PWR to clear the menu.

Deep Alarm

To set the deep alarm depth, press MENU DOWN repeatedly until DEEP ALARM appears.

Press UP ARROW to increase the deep alarm's depth setting or press DOWN ARROW to decrease it. The number in the deep alarm’s menu box shows the current deep alarm

setting. When the number reaches the desired setting, press PWR to clear the menu. When the bottom depth goes deeper than the alarm’s setting, an alarm tone sounds and a message box appears on the screen. Press PWR to silence the alarm. This turns the alarm sound off until the deep alarm is triggered again.

To turn the alarm off, press MENU DOWN repeatedly until DEEP ALARM appears. Press DOWN ARROW until the words OFF FEET appear, then press PWR to clear the menu.

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Lowrance electronic X51 manual Depth Alarms, Shallow Alarm, Deep Alarm