Lowrance ELITE-4X HDI Operation Manual page 27

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
Resets the Water Distance value to zero.
Transducer Type
Selects the transducer
attached to your unit. You must select
the correct transducer type to get the
best sonar performance from your
unit.
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model
Sonar Operation | Elite-4x HDI