Humminbird 500 SERIES 596C - Manual (Page 11)

3
DualBeam Sonar
Your 500 Series™ Fishfinder uses a
200/83 kHz DualBeam sonar system with a wide
(60°) area of coverage. DualBeam sonar is
optimized to show the greatest bottom definition
using a narrow (20°) beam yet can still indicate
fish found in the wide (60°) beam when the Fish
ID+™ feature is turned on. DualBeam is ideal for
a wide range of conditions - from shallow to
very deep water in both fresh and salt water.
Depth capability is affected by such factors as
boat speed, wave action, bottom hardness,
water conditions, and transducer installation.
How Sonar Works