Try this site. I have found it very useful;http://www.bbcboards.net/humminbird-sonar-gps/
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I finally got one. I ordered a Humminbird 678c HD and it shipped today. It's 2D only, but compatible with my powerdrive. I think it will mostly help this summer and next winter, but i'll have all spring to play with it. Have any of you got any experience with 600 series Humminbirds? Any tips?
Try this site. I have found it very useful;http://www.bbcboards.net/humminbird-sonar-gps/
A person should learn something new every day!
Good site you can learn a lot from there!