Transducer Setup; Depth Offset - Raymarine ST70 Instrument User Reference Handbook

4.1 Transducer setup

Wind, Depth, Speed and Temperature data are derived from
transducers and sensors around the boat. You should check the
accuracy of the displayed readings and calibrate as necessary. This
should be done whenever you install a new instrument or transducer
as part of the commissioning process.
Setting up transducers
The Transducer setup menu is used to calibrate the transducers and
sensors which are the source of much of the instrument data.
1. Press MENU.
2. Select Advanced options > Transducer setup.
The ST70 will search for transducers connected to the system
and display the results of the search as a list.
3. Press ENTER to proceed and setup the parameters for the
transducers found.
There are settings available for:
• Depth
• Speed
• Wind
• Temperature
• DST (Depth Speed, Temperature smart transducers)
• DT (Depth, Temperature smart transducers)
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4.2 Depth Offset

Depths are measured from the 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 waterline.
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. Then use
the depth instrument to set the appropriate offset value.
1
1 Waterline offset
2 Zero offset
3
Keel offset
If an offset is not applied, displayed depth readings represent the
distance from the transducer to the sea bed.
2 3
ST70 Instrument User reference
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