Depth, Keel Offset, Too Deep Alarm, Too Shallow Alarm; Set Depth Units; Set Too Deep Alarm - NorthStar NS3100 Multi Instrument Reference Manual

5 Depth, keel offset, too deep alarm, too shallow alarm

5-1 Set depth units

5-2 Set too deep alarm

Alarm is on
Deep alarm
value
12
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 as the distance
from the transducer to the surface, it will display
the depth from the surface to the bottom of the
water.
Keel offset
Water surface
Depth of transducer
Note: The boat illustrated uses a through hull transducer
The units can be METERS, FEET or FATH:
Press until DEPth is displayed, then hold
the units change; if necessary, hold
units change again.
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
A negative keel offset displays depth as
measured from a point below the transducer.
For example, if you set the negative offset as 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.
Transducer
until
until the
To set the too deep alarm:
1 Hold for two seconds to display the Too Deep
.
Alarm screen:
2 To change the alarm depth, press
3 To turn the alarm on or off, press
4 Press .
Keel offset
Positive value
Negative value
or .
.
Northstar NS3100 MULTI