Raymarine ST70 Instrument, Installation Manual

Page: 43 / 73

Chapter 3: Commissioning Procedures 33
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 3-1 .
Figure 3-1 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.
To access the required transducer:
1. With any operational Instrument page
displayed, press
MENU
to display the Main
Menu .
2. Scroll to Advanced Options , then press
OK
3. At the Advanced Options menu, scroll to
Transducer Setup .
Offset value
of 0.0
Waterline
offset
Keel
offset
D9343-1
D1
1
172-1
Advanced Options
Transducer Setup
Press OK to select
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