I have a 1974 41 Commander. I am considering adding a Garmin GPS unit. Has anyone used an "in the hull" transducer? How did it perform? The Garmin in the hull unit is limited to 5/8" thick fiberglass. Does anyone know the approximate thickness of a Commander hull off center from the keel?
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In the past I've answered this but a quick summary, I made a dam surrounding the location for the Puck, left the thru hull in place, made runs on the same GPS track with each and didn't find significant differences. I cleaned the area for the Puck, bonded it to the hull and at the next haul out another hole in the hull was eliminated.
Tim
FXA350030H
I installed the AirMar Brass 2" B-117 transducer in my '66 CCC 38 this past spring. It's a 200/50hz transducer that reports water temperature, too, and with PLENTY of thread space for my 3/4' thick hull. The B-117 is bulletproof. I went with the simple straight down view version and I installed it forward of my port side shaft maybe three feet, in that flat area just aft of my port side batteries, maybe a foot inboard. I had to get a conversion cable to make the eight hole plug from the B-117 work with a new four pin Garmin Echomap 5. The conversion plug is Garmin # 0101271900, 8 pin Xdcr to 4 pin Sounder. I love the results and the small unit doesn't overwhelm my helm. I use a Samsung tablet overhead that is CHEAP for my plotter, and I pair that with a Garmin GLO GPS unit, and those two together are super accurate. The EchoMap unit is decent, too -- it is nice to have two chart plotter units plus the depth and temp going when I'm exploring up a shallow river system. I plan to provide more permanent power plugs for the Samsung tablet and the Garmin GLO GPS before the season is over. BTW, all this was prompted by an aging Standard Horizon unit (70s) and an aging plastic thru hull transducer that was leaking and dangerous. I feel so much better now!