Simrad IS40 PRO, Operator'S Manual, Page: 22 / 32

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Setup | IS40 PRO Operator Manual
Depth
A datum (offset value) can be set, such that the depth display refers
to either the water line or the base of the keel.
+VE: Positive Datum for Waterline
-
VE: Negative Datum for Keel
(0.0)
Setting the depth offset displays depth readings from directly below
the keel or propellers of the boat, or from the waterline to the
seabed. This makes it easier to see the available depth, taking into
account the draught of the boat.
The offset value to be entered should represent the distance
between the face of the depth transducer, and the lowest part of
the boat below the waterline, or the distance between the face of
the depth transducer and the water surface.
Sea Temperature
If a suitable temperature sensor is fitted, the system will monitor the
current sea temperature.
The offset value to be entered should adjust the temperature
reading from the sensor to match a calibrated thermometer when
submersed in the water.