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Transducer options

Old 09-24-2018, 03:09 PM
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Default Transducer options

I have a 36 invincible with a simrad nss16 evo 3 and an s5100 with m285 hw in hull transducer not happy with it so I am wonder if anyone has done a tm265 on a similar hull or have good results qith them
Old 09-25-2018, 04:28 AM
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What is lacking in your current setup and what are you looking to achieve? Tm265 on a step hull with yield horrendous results.
Old 09-25-2018, 06:11 AM
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I understand it wont work while going not worried about that at all my in hull transducers just dont show detail like a transducer that will actually touch the water
Old 09-25-2018, 07:05 AM
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The TM265 and M285HW are two completely different transducers for two different applications. In your case, if you are looking for that broad wide beam coverage that the M285 gives, I would go with a B175HW-20 tilted element in front of the first step. You can add a second B175 on the other side for low frequency if desired, or even a third medium channel with the 5100. That will give you your direct water contact without loosing transom performance, even at slow speed
Old 09-25-2018, 07:52 AM
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Also..what is the location of the current M265 install...?..are they anywhere behind a step.?
Old 09-25-2018, 11:01 AM
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No they are both in front of the steps beneath the console the problem is I trailer the boat so I really dont wat to put a tilted element or a thru hull in so the transom mount is kinda my only option. My real question is would the work well at a drift or on anchor .
Old 09-25-2018, 11:11 AM
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Bronze and Stainless tilted flush mount transducers are safe for trailers.
Old 09-25-2018, 11:49 AM
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Defender I was just going to ask about them but you beat me too it anyone have any experience with them like the b175l
Old 09-25-2018, 12:31 PM
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Originally Posted by tunawishing View Post
anyone have any experience with them like the b175l

The B175C-L is best for bottom reading ...and will go deeper than the Medium or High bands....
But not the best for targets ( fish) when going deep..
Old 09-25-2018, 04:55 PM
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Lots of good info here, to answer the OP's question, yes a transom mount will read fine on any hull at anchor or drifting
Old 09-26-2018, 03:53 AM
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M285HW installation I did in an Invincible 40’ Cat reading 50mph in over 50’ of water and showing red snapper in a feeding frenzy. I was actually quite impressed with its overall performance.

Who did the installation on yours? Is the transducer mounted in an area that is free of coring?
Old 09-26-2018, 05:03 AM
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So I posted this in another thread but might be appropriate here, don't mean to derail. This is a pic of my INV 36, you can see the space that they give thats free of the core, its basically just enough for the R111/R599 tank. In the pic below thats an outline of the R599 with the circle being the B175 HW. I've been debating with friends on if its better to mount the B175 low and next to the keel to get it in a "glass only" spot or mount higher up the hull more like the bottom pic and do the core-prep procedure that Airmar calls for.... OP might find this interesting too. Note that I've not deconflicted strakes or bunks yet on my placement...



Old 09-26-2018, 05:27 AM
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Originally Posted by davidwademarine View Post


M285HW installation I did in an Invincible 40’ Cat reading 50mph in over 50’ of water and showing red snapper in a feeding frenzy. I was actually quite impressed with its overall performance.

Who did the installation on yours? Is the transducer mounted in an area that is free of coring?
Does coring affect the performance?

Last edited by Vantaredoc; 09-26-2018 at 01:56 PM.
Old 09-26-2018, 12:26 PM
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My 285 is under the console and I decored the hole and Mounted it to the outside skin of the hull
Old 09-26-2018, 12:48 PM
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Originally Posted by tunawishing View Post
My 285 is under the console and I decored the hole and Mounted it to the outside skin of the hull

Good..and do you have any photos etc. of the install?
Old 09-26-2018, 01:57 PM
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Originally Posted by tunawishing View Post
My 285 is under the console and I decored the hole and Mounted it to the outside skin of the hull
Why do you have to "decore"?
Old 09-26-2018, 01:58 PM
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It is an in hull you cant shoot through core
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Old 09-28-2018, 06:46 AM
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Originally Posted by Vantaredoc View Post
Why do you have to "decore"?
Sound travels much slower through air than it does through water or solids. This basically acts as a sonar wall for transducers.

Cored hulls have foam or wood cores that inevitably have air in them. Decoring means cutting the inner fiberglass liner, removing the core material, and mounting the in-hull transducer directly to the outer hull.

This is the same reason that planing boats at high speeds sometimes lose bottom readings, too much air gets between the face of the transducer and the water.
Old 09-28-2018, 06:50 AM
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Originally Posted by Defender View Post
Sound travels much slower through air than it does through water or solids. This basically acts as a sonar wall for transducers.

Cored hulls have foam or wood cores that inevitably have air in them. Decoring means cutting the inner fiberglass liner, removing the core materieal, and mounting the in-hull transducer directly to the outer hull.

This is the same reason that planing boats at high speeds sometimes lose bottom readings, too much air gets between the face of the transducer and the water.
Got it. Unfortunately I misread. I see now they are talking about a "in hull" shoot through type. Thank you for your explanation.
Old 09-28-2018, 07:21 AM
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Originally Posted by Vantaredoc View Post
Why do you have to "decore"?

M260 install in a foam cored Mckee 24
An example of an install on a form cored hull...link to THT member's install.

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Last edited by semperfifishing; 09-28-2018 at 08:03 AM.

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