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Garmin inboard transducer question

Old 11-28-2019, 04:48 PM
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Default Garmin inboard transducer question

I purchased a 19' maycraft recently and have a question about how to mount an inboard transducer for a garmin sonar. Previous owner never mounted the transducer but just had it laying adjacent to the transom on the centerline of the boat. He gave me the mounting kit for the oil bath setup but i had noticed that when i took the boat out that the transducer was picking up bottom very well. Even at speed. I was wondering is an oil bath the only way to do this or are there other ways to mount this that any of you have experience with?
Old 11-29-2019, 07:01 AM
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Is the mounting kit you refer to a few round black plastic cups? That would indicate that the transducer is a GT15M-IH.
Bond the cup to the hull at the appropriate angle so the transducer is level and where the hull is solid fiberglass. Once bonded, fill with mineral oil or antifreeze and screw the transducer to the cup.
Old 11-29-2019, 07:58 AM
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Originally Posted by coastboater View Post
Is the mounting kit you refer to a few round black plastic cups? That would indicate that the transducer is a GT15M-IH.
Bond the cup to the hull at the appropriate angle so the transducer is level and where the hull is solid fiberglass. Once bonded, fill with mineral oil or antifreeze and screw the transducer to the cup.
Thank you for the response. yes. Its one large plastic cyllinder with an angle cut onto one end and another plastic cup that looks like it'd be a cap. What sealant would you use?
Old 11-29-2019, 01:00 PM
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Clean, abrade (sand), clean with alcohol where you want it to go.
Put a heavy bead of 5200 on the bottom (angled) portion of the cup you're going to use and gently press into place. I usually twist it a few times to make sure the adhesive is disbursed. Make sure the cup matches your hull's deadrise.
Leave it alone for 24 hours while the 5200 cures.
Once I had my location set and done with trial fitting I would put a few locating pieces (rocks&#128512 just to position the cup and make sure it doesn't move while setting up.
Old 11-29-2019, 01:09 PM
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I would talk to the previous owner and ask him if it has been in the boat for a while. If it has, then why mess with it?

But I would also touch the transducer casing to feel how warm its getting after using it for an hour. If it feels more than slightly warm, then you might conclude that the antifreeze bath may serve a cooling function, as well as a way to shoot straight down instead of perpendicular to the bottom of your hull, off to one side.

I am a little surprised that it is functioning well without a special preparation as it is my understanding that Mayfair cores their hulls with plywood, which is usually a no no for an in hull transducer to shoot through. So if you go ahead to install it, then smooth the bottom where its mounted now and mount the tank there as the owner may have removed the coring to fill with solid fiberglass to get the sounder to work better there when he installed it.

Last edited by Bullshipper; 11-29-2019 at 01:14 PM.
Old 11-29-2019, 01:59 PM
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Lots of helpful tips everyone. Thank you all for the help. I never considered the oil could serve as a cooling medium. I had only thought it was to help the soundwaves propagate. As to the hull having been prepped for this by the previous owner i cant say yet. I really dont think it has since there are no signs of any alterations to anything back there and that the transducer was just lying there loose as if it had been forgotten about. I'll try to follow up on that one.
Old 11-29-2019, 02:41 PM
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My son has his Garmin transducer sitting in the bottom of his kayak. Used duct putty from Lowes electrical section (a bit hard to find but it’s there) and it’s like a clay/putty. Formable by hand. Never dries. Used to seal external holes in houses and such. Anyway, he formed a wall about 1” 1.5” high outward 1/4” - 1/2” around his transducer, laid transducer in and pinched middle spots on side (one each side in middle of length) and a bit at each end. That holds transducer steady. Then each time he heads out he puts a cupped hand of water into the well built by putty and which is holding transducer in like a boat fixed in position. That water takes out noise on Garmin screen at shallow depths. Water temp equalizes after about 30-45 minutes reading through the thin hull. I imagine on fiberglass boat that water temp reading will be off a bit. That putty is easily removed and remolded if needed. Never dries but sticks onto surfaces very well. Seals well.
Old 11-29-2019, 07:52 PM
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If you use 5200, or similar, to fasten either the 'ducer or the well to the hull, apply it to the center, and let it spread outward. If you apply in a doughnut shape, you may trap an air pocket in the center, which can affect your readings
How well 5200 holds is directly proportional to your desire to move it in the future.
Old 11-29-2019, 08:21 PM
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I've used shoot-thru-hull transducer pods for many years and never bonded them to the hull. In my case. I was able to wedge them under the battery shelf in the bilge. This works well, but you have to have enough water in the bilge covering the pod. You also need a hull bottom that is solid fiberglass, not a sandwich bottom. Over the years, I've replaced the sonar unit more than once and I've never had a problem removing the old transducer because it was never glued down to begin with. You say you are getting good readings as it is, so why glue it down ?
Old 11-29-2019, 09:30 PM
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I've got the same x-ducer and bonded it to the hull w/Six-10 thickened epoxy. Filled the tub w/RV antifreeze per mfgr. recommendations and it performs great at all speeds.
Old 11-30-2019, 06:44 PM
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Originally Posted by Sproly View Post
I purchased a 19' maycraft recently and have a question about how to mount an inboard transducer for a garmin sonar. Previous owner never mounted the transducer but just had it laying adjacent to the transom on the centerline of the boat. He gave me the mounting kit for the oil bath setup but i had noticed that when i took the boat out that the transducer was picking up bottom very well. Even at speed. I was wondering is an oil bath the only way to do this or are there other ways to mount this that any of you have experience with?
http://www.airmar.com/uploads/Instal.../17-217-01.pdf

17-573-01.pdf

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