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30 ST60 Tridata Instrument Owner’s Manual
depth from the water line. In order to do this, you need to know the
vertical separation between the transducer position and:
• Thebottom of the keel.
• The water line.
Use the
trip (decrement) and reset (increment) keys to set the required
offset value:
• Ifyou want to display the depth reading from the transducer,set a
value of 0.0.
• Ifyou wantto apply a water lineoffset,adjustthe displayedreading
untilthe appropriatepositive offsetvalue is shown.
• Ifyou want to apply a keel offset,adjust the displayedreading until
the appropriate negative offset value is shown.
Shallow alarm lock
When set to on, prevents alteration to the shallow depth alarm threshold.
Offset value
of 0.0
+ve offset
values
-ve offset
values
D4352-2
Depth offsets
81040_1.book Page 30 Thursday, November 7, 2002 10:21 AM