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19.5 Sonar transducer calibration
Sonar transducers should be calibrated to ensure accurate readings are
displayed on the MFD.
Depth offset
Depths are measured from the transducer face to the bottom (e.g.: seabed).
An offset value can be applied to the depth data so that the displayed depth
reading represents the depth reading taken from either the keel (negative
offset) or the waterline (positive offset).
Before setting a waterline or keel offset, establish the vertical distance
between the transducer and waterline or the bottom of your vessel's keel, as
appropriate. Then set this distance as the depth offset value.
1.
[Below waterline] — The depth reading will be increased from the
transducer's default reading.
2. [Below transducer] — This is the default reading from the transducer
(zero offset applied).
3. [Below keel] — The depth reading will be decreased from the transducer's
default reading.
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Setting a depth offset
You can set the point depth readings are taken from.
1. Open the [Fishfinder app].
2. Open the [Transducer] settings menu: [Menu > Settings Transducer].
3. If you have more than 1 sonar transducer installed, then you will need
to select the relevant transducer.
4. Select either [Below keel], [Below waterline], or [Below transducer] as
required.
i. If you have selected [Below keel] enter your transducer's distance
above the lowest point of your keel in the offset field.
ii. If you have selected [Below waterline] enter your transducer's distance
below the waterline in the offset field.
Setting a temperature offset
If your sonar transducer includes a temperature sensor then you can check
and calibrate your temperature reading.
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