gps transom transducer through hull??

[seaesta]

In a fit of excitement I bought a Garmin GPS MAp 298 at the Boat show. This is great but the transom transducer for the fish finder is not going to mount easily at all. Does anyone knwo whether it is feasible to get the transducer to sound through the hull i.e. mount it on the inside and if so how.
Thanks
Martin

 

[ChasB]

I used blue tack (be careful about air bubbles), and then sealed it in with sikaflex on top of the blue tack when I'd found a good position. if I have to remove it now I can cut an inch around and it will just lift out.

 

[tazzle]

Yep, try it out and find a place where it works through the hull. There are several methods for fixing - some will recommend a wet oil bath, others ordinary silicone sealant or some other removable medium. I used araldite to fix my Garmin transom transducer once I'd found the right place - works a treat.

 

[gjgm]

good point. I have the external one- not that I get a reading above 2knts! And I m not paying for a liftout just to adjust it.Hadnt thought of getting an internal one. Do a search maybe on MBC as there have been many lengthy posts over the years about how to do this.
Personally what I ve done before..
think where logically might have clear undisturbed water underneath -another transducer is a good clue. Either fix as a test, or place the transducer in a bag of water and hold onto the hull while underway, until you get a good reading. Dont use rapid araldite as it can form bubbles in the glue. As the hull is likely to be sloping, make a little bath of blue tack- as normal araldite is very runny and will flow out- and glue onto the hull.
Thats it. Pretty easy!
Let me know what the in hull transducer costs!

 

[seaesta]

Hi gigm. The point is I am wanting to use the transom type transducer supplied but rather than bolting it on the outside I want to mount it internally. All further contributions appreciated Martin

 

[spannerman]

Yes you can mount it internally, just make sure that there are no strakes on the outside to disturb the water flow, and the hull is solid not double with an inner and outer moulding.
Every type I have mounted warns not to use silicon or flexible compound as this will affect the signal, it relies on a 'hard contact' with the hull so use an epoxy based adhesive and make sure there are no air bubbles under the transducer. You can also use the oil bath method which also gives good results.

 

[ChasB]

The instructions that came with mine said to use plasticine to find a good position. Plenty of folk use blue tack.

 

[JKay]

I've fitted 3 so far with Silicone and all are still working
/forums/images/graemlins/grin.gif
Cheers Joe