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 Catalina 25 Specific Forum
 Which Transducer		  New Topic  Topic Locked
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mrapkins
Navigator

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USA
124 Posts
Initially Posted - 02/15/2010 :  12:14:04  Show Profile
I am having difficulty locating the correct shoot-thru-hull transducer (NO HOLE in boat) for my Garmin GPSMAP 440S. I contacted Airmax and they recommend their P79 product, but no-where can I find if it is compatible with my Garmin device. It looks like it will be but nothing definitive. The P79 comes with an interesting mounting system that avoids use of the wax toilet ring, so your thoughts on that are also welcome.

I guess the fundamental question here is do all 50/200 KHz transducers use the same "communication" protocol.
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DaveR
Master Marine Consultant

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USA
2015 Posts
Response Posted - 02/15/2010 :  12:41:01  Show Profile  Visit DaveR's Homepage
Try the standard transducer with a wad of toilet ring wax under it. Clean the hull area where it'll go and don't leave air bubbles in the bees wax. Mine and others have worked fine using this method.
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islander
Master Marine Consultant

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USA
4018 Posts
Response Posted - 02/15/2010 :  13:58:38  Show Profile
Well I searched through Garmins site (I really have nothing to do right now) And it seems that the 440s came with a transom mount transducer that can also be mounted as a shoot through the hull setup. It also appears that the transducers are model specific. I would get the one from Garmin http://g.factoryoutletstore.com/cat/19678/Garmin-Plastic-Transducers.html just to be safe. I would also go to the installation instructions for more info on hull thickness etc.https://buy.garmin.com/shop/store/manual.jsp?product=010-00515-40& cID=148& pID=8055
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mrapkins
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USA
124 Posts
Response Posted - 02/16/2010 :  06:11:06  Show Profile
It looks like nearly all the transducers are manufactured by Airmar. The Airmar P79 model is re-sold by a variety of folks (Defender sell it as being manufactured by Raymarine but you can clearly see the Airmax name on the picture) and it is also re-sold by Garmin. Many thanks to the previous poster; the price for a new unit from the FactoryOutletStore.com (with free shipping) is about $50 less than Defender.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.