Imaging Frequency (Down Imaging® Views Only [688Ci Hd Di]) - Humminbird 688ci HD DI Operation Manual

Imaging Frequency allows you to select which frequency to apply to the Down
Imaging® beams (455 kHz or 800 kHz). For the best overall image quality and
depth, select 455 kHz. For the sharpest image (but limited depth capability),
select 800 kHz.
Imaging Frequency
(Down Imaging® Views only [688ci HD DI])
Settings: 800 kHz, 455 kHz; Default = 455 kHz
45°
800kHz
455kHz
16°
455kHz
25°
200kHz
75 Degree Total Coverage
115
75°
Sonar Menu Tab