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post #1 of 5 Old 12-15-2009 Thread Starter
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GARMIN GPSMAP 421s

Has anyone experienced with a shoot-thru-hull transom transducer installation? Seems nice to avoid drilling a hole in the hull, but what happens to the sonar sensitivity? The installation instructions specify that hull can be no more than 5/8" (9.53 mm) thick; any idea on the thickness of a Tripp 33 hull?

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post #2 of 5 Old 12-15-2009
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I've been using a shoot-thru transducer for my Garmin 545s for a couple of seasons now and sensitivity seems fine. I placed the ducer a few inches off the centerline but don't know the hull thickness of a Pearson 28-2 at that spot. I didn't give hull thickness a thought, but do make sure your hull is solid and not cored--that's a show stopper.

Tom K

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Northern Chesapeake Bay

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post #3 of 5 Old 12-16-2009 Thread Starter
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Thanks. Do you know the model of your tranducer? Mine says it is a "transmon mount depth and temperature transducer, 50/200 kHz" and yes, I believe the hull is solid (I will double chack, though).
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post #4 of 5 Old 12-16-2009
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Sorry, don't know the transducer model--it's the dual frequency model that came with the unit. Made by Airmar, I believe.

Tom K

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post #5 of 5 Old 12-16-2009 Thread Starter
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Ok, seems it is the same.
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