Don't confuse frequency with beam width.
I think that's what I was doing...
I got this from garmin:
Quote:
Dual beam is only reference to the beam that the transducer shoots to
the bottom of the waterway. The units enable a transducer to shoot two
beams at once at two frequencies. The transducer is not enabled with the
dual beam settings. The units enable the transducer to use this feature,
and only certain units enable this. Transducers run on the frequency
settings, which differ, depending on useage. The frequency is the sine
wave, and the cone is the angle that the frequency shoots at.
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