Here are the specs for the HB 597ci HD DI Combo...
597ci HD DI Combo :: Marine Fishfinder :: Humminbird
"c" stands for color display
"i" stands for internal GPS antenna
"Combo" stands for GPS chartplotting
The 597 has 2 separate 2d sonar beams and 2 separate DI sonar beams...
Here is a depiction of the 2 DI beams (455kHz and 800kHz) and the two 2d beams (200kHz and 455kHz)...
Having a mental picture of the shape of the 2 different types of sonar beams (2d and DI) will help in the learing curve of getting the most out of the unit...
2d sonar beams are conical...
DI sonar beams are fan shaped...
Rickie


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