Short Wave Sportfishing wrote:
Two seperate frequencies is a different issue than two at the same
frequency which is what I assumed the OP was talking about.

Correct, my original post was assuming they'd be the same frequency. My
experiences with the Garmin units was they can provide either separate
transducers for 50mhz, or 200 mhz, or a combination single transducer
with both frequencies. The unit can be set for either or both, depending
on the needs.

I am no electrical engineer, but as I understand it, the 200mhz was
better suited to the shallower depths, while the 50mhz was more for the
deeper depths. Given most all boating will be in less than 20 ft, with
the occasional voyage to maybe 75-100 (Boca Grande).

Time to start Googling and reading.

Tom - i am curious to know what units you are using and what is your
overall satisfaction with it/them. If you were to outfit your boat
again, would you pick the same one? Same manufacturer? Or completely
different?