Ping Speed; Downscan Options - Lowrance HOOK-4x Operation Manual

NOTE: When using a custom range,
you may not receive any digital depth
readings, or you may receive incorrect
depth information.
Frequency
Controls the transducer frequency
used by the unit. 800 kHz offers the
best resolution, while 455 kHz has
greater depth penetration.

Ping Speed

Controls the rate the transducer uses to send sonar
waves into the water. Ping speed adjustments can
help reduce interference from other transducers.

DownScan options

Noise Rejection
Uses advanced signal processing to monitor the
effects noise (boat pumps, water conditions,
engine ignition systems, etc.) has on your display,
and then filters out undesired signals.
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DownScan operation | HOOK X series