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73Northstar Explorer 657 Installation and Operation Manual
Keel Offset
A depth transducer measures depths below
where the transducer is mounted on the boat,
usually the bottom of the boat. The 657 calculates
the depths to display by adding the keel offset to
all measured depths.
A Have a zero keel offset to display depths
below the transducer.
B Enter a positive keel offset to increase the
displayed depth. For example to display the
total depths below the surface, enter the
depth of the transducer below the surface.
C Enter a negative keel offset to decrease the
displayed depth. For example, to display the
depths of clear water below the boat, enter
minus the depth of the deepest part of the
boat below the transducer.
Speed range
The maximum reading to display on an analog
boat speed gauge (see section 10). Choose a
range suitable for your boat.
Press
twice, then select Time:
Local offset
The difference between local time and UTC
(GMT). Change local offset when daylight saving
time starts and ends. The range is 0 to ± 13 hours,
in 30 minute steps.
17-13 Setup > Time
1 Select Local offset.
2 Press
or to change the offset, then
press .
Time format
The options are 24 hour or 12 hour.
Date format
The options are dd/MMM/yy, MMM/dd/yy,
dd/MM/yy or MM/dd/yy.
See section 2-7-2
17-14 Setup > Favorites
Fuel
See section 12-7, Calibration.
Transducer;
depths measured
below here
A
B
C
Depths measured
below here
Depths measured
below here