Furuno 520 - Manual (Page 56)

5. ALARMS
5-6
5.1.7 Setting the depth alarm
The depth alarm sounds when the bottom is shallower, deeper within or outside
the range setting.
Note:
To use the depth alarm, depth data from an external sounder is required.
1. Rotate the course control knob to select “DPT” from the ALARM SETUP
menu.
2. Press the course control knob to show the depth alarm options window.
SHAL.
DEEP
INSIDE
OUT
OFF
Depth alarm options window
3. Rotate the course control knob to select the condition.
OFF: Turn the depth alarm off.
SHAL. (shallow): The alarm is released when the bottom is shallower than the
value set.
DEEP: The alarm is sounded when the bottom is deeper than the value set.
INSIDE: The alarm is sounded when the bottom is within the range set.
OUT: The alarm released when the bottom is outside the range set.
When selecting INSIDE or OUT OF RANGE, set upper and lower limits, using
three digits. For SHALLOW or DEEP, set a value (Setting range: 0 to 9999.9
ft/m/FA/PB).
4. Press the course control knob.