Depth transducer offset
Depth is 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).
CalibrationDepthDepth calibrationDepth offsetBefore 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.
Waterline — The depth reading will be increased from the transducer’s default reading.
Transducer — This is the default reading from the transducer (zero offset applied).
Keel — The depth reading will be decreased from the transducer’s default reading.