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Comments about Humminbird HDR610 Digital Depth Sounder (In-Hull Mount Transducer):
I've had one of these in my ski boat for about a year and have been very satisfied. The in-hull mount works perfectly from within my fiberglass hull (epoxied in place per installation instructions) and overall the installation of the unit was fairly easy. The depth measurement is quite accurate and the display refresh rate is easily high enough for navigating even in shallow water.