I take a look at the very cool RT4 bait boat and the very sophisticated echo unit with built in GPS - The TF640 Toslon Echo Sounder with GPS
Available for the RT4 bait boat, this echo unit not only allows you find the spots in your swim but it also allows you to mark the spots and record them via GPS. These waypoints can be stored on the unit for future trips.
Available from CarpLounge
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