Transom mount transducer on 330.

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wspitler

GreatGrady Captain
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Location
Inglis, FL
Model
Express 330
I am considering putting a Garmin GT 56 transom mount transducer on my 330 between the engines. Has anyone done this? Does the side scan work with the engines tilted slightly up? Looking for advice and comment.
 
I ran a transom mount Gt51M between motors on a 265 express it worked very well at trolling speed or less but not well on plane. I have since mounted a thru hull Gt 51 on the keel and it is great
 
I too have done it my 265 worked well similar hull design,. I would epoxy a piece of starboard material to transom and then screw transducer to that. Avoid adding holes in transom bellow water line. My 2 cents
 
Thanks! I already have a 1K thru hull that works good, but looking for side scan like I have on my other boat. I used Sternmate on my other boat to keep from drilling, plus provides easy adjustment. The garboard (drain) plug being centered on the transom (keel alignment) is going to be a challenge. Did anyone offset the mounting due to the garboard (drain) plug? If so how far? I was thinking about centering my transducer mount over the plug with a set back drop down mount so as to be directly in line with the keel. Where along the deadrise did you guys mount the TM transducer if not centerline? Garmin says it should be 15" from the props. Did you have to tilt the engines to get good sidescan? Thanks for your info!
 
Did not tilt engines any more than usual running position. Sidevu worked fine at slow speeds in 150 Ft. On plane it did not work and traditional was degraded quite a bit.
Great for finding and "seeing" wrecks. I would not be without it.

Changing to a Thru hull made it fantastic even at speed. I can look for a wreck doing circles at 20mph.


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Thanks for that picture and info, Skunk. I almost made that same location modification with my Simrad 3 in 1 transducer last month but chickened out at the last minute. I was unsure if there would be too much turbulence located just offset from the keel. I can't get much of a port side-scan view where I have it mounted on the starboard side of the transom now. I think the problem may be turbulence from the baitwell pump through-hull fitting. Next time I pull the boat home I'll put a Stermate close to the garboard plug and give it a try.

No side-scan units were designed to work at high speeds. Does your thought hull actually give a good side image at 20 mph or were you talking about 2D?
 
Doc, my GT 56 and Sternmate arrive tomorrow. I plan to do a similar install near the garbage plug but maybe I can figure out a way to do it over the top of the garbage plug and make it centerline still researching. Let me know how yours comes out and I’ll do the same. Where do you currently have your transducer?
 
Doc Stressor said:
No side-scan units were designed to work at high speeds. Does your thought hull actually give a good side image at 20 mph or were you talking about 2D?
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yes. in 150 ft. Found a wreck I had bad numbers for. Been looking for it for years everytime I was in the area (Its way out by itself). Just covered ground at 20mph doing a search and finally there it was, off to left, a mile from my numbers.
 
wspitler said:
I am considering putting a Garmin GT 56 transom mount transducer on my 330 between the engines. Has anyone done this? Does the side scan work with the engines tilted slightly up? Looking for advice and comment.
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I would avoid screwing anything into a transom. Use the flats and spend the extra $'s on a good thru hull with fairing block.
 
kees.barfield said:
This work great for mounting transom transducers without drilling transom
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SEAWORTHY INNOVATIONS Stern Pad Jumbo White - Screwless Transducer/Acc. Mounting Kit (for Large 3D Scan Transducers)
- Made in The USA with Genuine 3M VHB Adhesive

$44.00 on Amazon


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DennisG01 said:
Thanks! It seems like these pop up every so often. Probably the same person just signing up under different handles each time
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Probably so. They get in somehow but once you guys report them,,, they're gone.
 
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