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Thanks - I'll be checking everything out but input is very helpful.
Anybody using Hummingbird - something like this?:
https://www.humminbird.com/Products/H...RP-GPS-G2/
or Raymarine such as this? Includes US lakes and Coastal Mapping as well as Transducer:
http://www.raymarine.com/dragonfly/dr...onfly4pro/