1 Operation
Whenever power is applied the depth sounder is active and water depth is displayed. If the sonar signal does not show a bottom the display will indicate “-
Note: The maximum depth decreases as boat speed increases.
Alarms
Two types of alarms can be set; the Deep Alarm and the Shallow Alarm. The Deep Alarm can be set as high as 184 metres (605 feet) while the Shallow Alarm can be set as low as 0.3 metre (1 foot).
Whenever the water depth is greater than the Deep Alarm setting and the alarm is enabled an alarm will sound. The alarm repeats two short beeps and alternates DAL and the water depth on the display.
Whenever the water depth is less than the Shallow Alarm setting and the alarm is enabled an alarm will sound. The alarm repeats a single long beep and alternates SAL and the water depth on the display.
Alarms On/Off
Alarm settings are saved in memory.
To turn the alarm on, press 
(ON). An arrow on the lower right corner of the display will show (next to the Alarm Bell), to indicate that the alarms are on.
ON
To turn the alarms off, press 
(OFF). The arrow in the lower right corner will extinguish.
OFF
Note: The arrow will flash if alarms are turned ON but the shallow alarm is individually set to OFF. See next section.
Shallow Alarm
To set the shallow alarm:
1. Press 
for three seconds. The display will show:
ON Press for 3
Seconds
2.After a few seconds the display will indicate the current Shallow Alarm depth setting.
3.Use 
and 
to change the value. If either key is held depressed for more than one second the reading will increase or decrease rapidly.
4.When the alarm is set, exit by pressing both 
and 
simultaneously. Alternatively, if no keys are pressed for a period of 5 seconds the normal depth display will resume.
ONOFF
Press simultaneously to exit
Note: If the reading is decreased to below 1.5 feet (or equivalent) the display will
show OFF and the alarm will be disabled. The alarm can also be disabled by pressing both 
and 
for 5 seconds. The word OFF will be displayed but the alarm depth will be retained for future use.
Deep Alarm
To set the deep alarm:
1. Press 
for three seconds. The display will show:
OFF Press for 3
Seconds
2.After two seconds the display will indicate the current Deep Alarm depth setting.
4 | Northstar Explorer D210 Installation and Operation Manual |