26
ST70+ User Reference Manual
A Wind transducer may also be fitted, to provide wind speed and direction
information.
Depth offset and sea temperature must be calibrated as part of the Dockside setup,
but the exact method for calibrating these parameters depends on which transducers
are fitted:
•
With conventional transducers, the Depth offset and water temperature are cali-
brated separately.
•
With a smart transducer, the depth offset and water temperature setup are part of
one continuous procedure.
The speed and wind functions are calibrated later as part of the Open water
calibration.
Depth offsets
Depths are measured from the Depth transducer to the sea bed, but you can apply an
offset value to the depth data, so that the displayed depth reading represents the
depth to the sea bed from either the keel or the water line.
If an offset is not applied, the displayed depth readings are from the transducer to the
sea bed.
Before attempting to set a
waterline
or
keel
offset, find out the vertical separation
between the transducer and either the waterline or the bottom of the keel on your
vessel, as appropriate. See
Figure 2-1
.
Figure 2-1 Depth offsets
Accessing transducer setup
Use the Select Display button on a suitable Instrument keypad, to select a convenient
Instrument to carry out the Instrument system dockside setup procedures.
Offset value
of 0.0
Waterline
offset
Keel
offset
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