Lowrance electronic LMS 335C DF - Manual (Page 70)

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At left, Sonar Alarms menu, with Adjust Zone command selected.
At right, Adjust Zone Alarm selection box, with Upper selected.
3. To set the upper boundary for the Zone Alarm, use
← or→ to select
U
PPER
, then press
↑ or ↓ to move the top of the bar to the desired depth.
4. To set the lower boundary for the Zone Alarm, use
← or→ to select
L OWER
, then press
↑ or ↓ to move the bottom of the bar to the desired depth.
5. Press EXIT |
← to
Z ONE A LARM E NABLED
| ENT | EXIT | EXIT | EXIT . Now, any
echo — fish, bottom, structure — within the zone alarm's depth range
will trigger the zone alarm.
6. To turn off the alarm, press MENU | MENU |
↓ to
A
LARMS
| ENT |
↓ to
S ONAR A LARMS
| ENT |
↓ to
Z ONE A LARM E NABLED
| ENT | EXIT | EXIT | EXIT .
To switch to a different depth setting, open the Sonar Alarms menu and
repeat the instructions in steps 3 and 4 above.
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.