3 Depth, keel offset, too deep alarm, too shallow alarm
Depth and keel offset
The displayed depth is the distance from the transducer on the boat to the bottom of the water, plus or minus an offset which is called the keel offset:
A positive keel offset displays depth as measured from a point above the transducer.
For example, if you set the offset to the distance from the transducer to the surface, it will display
the depth from the surface to the bottom of the water.
A negative keel offset displays depth as measured from a point below the transducer.
For example, if you set the offset to minus the distance from the transducer to the bottom of the keel, it will display the depth from the bottom of the keel to the bottom of the water.
Keel offset |
|
Water surface | Keel offset |
| |
Depth of transducer | Positive value |
| |
Transducer | Negative value |
Note: The boat illustrated uses a through hull transducer |
|
The units can be METERS, FEET or FATH: Press 
; if necessary, press 
again.
3-2 Set too deep alarm
The too deep alarm sounds if the alarm is turned on and the depth becomes equal to or more than the too deep alarm depth. To mute the alarm, press 
.
To set the too deep alarm:
1Hold 
for two seconds to display the Too Deep Alarm screen:
Alarm is on
Deep alarm value
2To change the alarm depth, press 
or 
.
3To turn the alarm on or off, press 
.
4Press 
.
3-3 Set too shallow alarm
The too shallow alarm sounds if the alarm is turned on and the depth becomes equal to or less than the too shallow alarm depth. To mute the alarm, press 
. To set the too shallow alarm:
1At the Too Deep Alarm screen, hold 
for two seconds to display the Too Shallow Alarm screen:
Alarm is off
Shallow alarm value
2To change the alarm depth, press 
or 
.
3To turn the alarm on or off, press 
.
4Press 
.
6 | Northstar Explorer D310 Installation and Operation Manual |