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Hi all, Enjoying some really good time in Georgian Bay. First time and wonder why we waited such time before doing this. When staying in channels, all is fine. But when you want to explore, or access some special bays, you can see rocks and smell the danger. Someone recommended us a bow sonar, to have a clear view of what is underneath when leaving the channel. Does anyone have some, did any research or have any recommendation? We have a garmin GPSMap 721 - anything I can plug in or separate? Thank you!