Lowrance elite-4x Operation Manual page 26

the distance from the transducer to the lowest part
of the keel. If, for example, the keel is 3.5 feet below
the transducer, it will be input as –3.5 feet.
Water speed calibration
Calibrates a paddlewheel speed sensor with speed
data from a GPS source.
Temperature calibration
Calibrates data from the transducer temperature
sensor with data from a known temperature source
to ensure the accuracy of temperature information.
Reset water distance
Reset Water Distance to zero.
Transducer Type
Selects the type of transducer model attached to
your unit.
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Sonar Operation | Elite X series