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Go Back   SailNet Community > On Board > Gear & Maintenance > Electronics > GARMIN GPSMAP 421s
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Thread: GARMIN GPSMAP 421s Reply to Thread

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Topic Review (Newest First)
12-16-2009 06:00 PM
csilva Ok, seems it is the same.
12-16-2009 05:30 PM
arf145 Sorry, don't know the transducer model--it's the dual frequency model that came with the unit. Made by Airmar, I believe.
12-16-2009 12:36 PM
csilva 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).
12-15-2009 09:45 PM
arf145 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.
12-15-2009 07:32 PM

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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