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.
AHave a zero keel offset to display depths below the transducer.
BEnter 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.
CEnter 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.
A 
Transducer;
depths measured below here
| Depths measured |
B | below here |
|
C
Depths measured below here
Fuel
See section
17-13 Setup > Time
Press | twice, then select Time: | 1 Select Local offset. |
2 Press 
or 
to change the offset, then
press 
.
Time format
The options are 24 hour or 12 hour.
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.
Date format
The options are dd/MMM/yy, MMM/dd/yy, dd/MM/yy or MM/dd/yy.
17-14 Setup > Favorites
See section 2-7-2
Northstar Explorer 657 Installation and Operation Manual | 73 |