Humminbird 778C - Manual (Page 13)

5
Xtreme Depth Sonar
(Xtreme Depth Series™ models only [778c HD XD])
Your 778c HD XD Fishing System uses the XD
transducer to provide extreme depth coverage
with DualBeam PLUS™ technology.
The Xtreme Depth sonar beams can be operated
at two frequencies: 50 kHz (74°) and 200 kHz
(20°). The wide, 50 kHz beam transmits at a low
frequency to provide greater depth coverage, up
to 2500 ft (762 m). The narrow, 200 kHz center
beam transmits at a high frequency to provide
maximum detail at shallower depths.
The DualBeam PLUS™ technology allows you to
view the sonar returns blended together,
separately, or side-by-side (see Sonar Menu
Tab: Beam Select and Views for more
information).
Depth capability is affected by such factors as
boat speed, wave action, bottom hardness,
water conditions, and transducer installation.
How Sonar Works