Lowrance HOOK-4 Operation Manual page 22

Sonar frequencies
Best depth penetration with
50 kHz
lower resolution
Wider cone angle provides
83 kHz
more bottom coverage and
easy lure tracking
Highest sensitivity and best
200 kHz
target separation in shallow
water
Provides the best depth pen-
Low CHIRP
etration with lower resolu-
tion images
Better
Medium CHIRP
than High CHIRP with minimal
loss of target separation
Better resolution in shallow
High CHIRP
water than Medium CHIRP
Sonar Operation | HOOK series
depth penetration
Custom high
Custom medium
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. When using
fishing modes, ping speed settings are optimized
for the selected fishing conditions, so in most
cases, adjustments are not necessary.
22
Selects a custom single
frequency from within High
or Low frequency ranges to
help reduce/eliminate inter-
ference from other CHIRP
transducers