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Yet another Transducer recommendation thread

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Yet another Transducer recommendation thread

Old 01-26-2021, 07:30 PM
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Default Yet another Transducer recommendation thread

Looking for a flush mount thru-hull for my new-to-me blackfin 29 to pair with a Simrad NSS EVO3. Fishing out of Beaufort Inlet in NC typically 50'-300' very occasionally a bit more or less. Primary needs: (1) identifying hard bottom, ledges, etc. at slow and cruise speeds (2) locating bait and predators and (3) parsing target species to the extent possible. We target the small guys (trigger, black sea bass, beeliners, etc) and also of course grouper. We troll also (mahi, hoo, tuna) but in my experience the transducer seldom provides us anything useful while trolling other than knowing we're passing over a school of something now and then, which seldom are what we're targeting.

On my last boat I had a B75M which frankly I never liked. Everything on the bottom looked like mush. The water column was much clearer and easier to read than the bottom - which is opposite of what we needed for the most part.

Thanks in advance for any thoughts/input/suggestions.
Old 01-27-2021, 09:14 AM
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B175H will give you the best bottom detail. At 130 kHz fixed frequency it will give acceptable coverage for trolling.
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Old 01-27-2021, 09:24 AM
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Thank you.
Old 01-27-2021, 11:32 AM
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Are any of the 175's (M, H, HW) particularly better or worse at holding bottom at speed?
Old 01-27-2021, 11:50 AM
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I have a B175M and I bottom Fish almost always. I do not like it, and it doesn't hold bottom at speed... Could just be my setup i'm not sure or the transducer may be faulty but I haven't found anyone that knows why it doesn't read properly. Boat had it installed when I bought it, I do better finding fish with the Furuno and P66 which is not what I expected. I installed that and it holds bottom up to 30knts.
Old 01-27-2021, 12:04 PM
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Originally Posted by one wolf View Post
Are any of the 175's (M, H, HW) particularly better or worse at holding bottom at speed?
I haven't seen any issues with H's or M's above 40 knots, never installed an HW. The L's will pick up more noise at higher speeds but that's normal for any lower frequency ducer.
Old 01-27-2021, 12:15 PM
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Originally Posted by jdunk View Post
I have a B175M and I bottom Fish almost always. I do not like it, and it doesn't hold bottom at speed... Could just be my setup i'm not sure or the transducer may be faulty but I haven't found anyone that knows why it doesn't read properly. Boat had it installed when I bought it, I do better finding fish with the Furuno and P66 which is not what I expected. I installed that and it holds bottom up to 30knts.
This was pretty much exactly my experience with my B75M on my last boat, including the part where I couldn't find anyone that knew why it wouldn't read properly. Simrad even traded out the transducer for me and the new one performed exactly the same.
Old 01-27-2021, 12:45 PM
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Originally Posted by one wolf View Post
Are any of the 175's (M, H, HW) particularly better or worse at holding bottom at speed?
Narrow cone and high frequency (200 kHz) is best for tracking the bottom at speed, B175H will be the best unless it's very deep.

Old 01-27-2021, 01:03 PM
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Originally Posted by one wolf View Post
This was pretty much exactly my experience with my B75M on my last boat, including the part where I couldn't find anyone that knew why it wouldn't read properly. Simrad even traded out the transducer for me and the new one performed exactly the same.
The B175M is basically the jack of all trades I believe. And also for medium depth deeper water.
If you want bottom detail specifically the B175H works better I think.

If you really want a lot of different capabilities you might need more than one. One will not be better in all cases.

And the even higher than H frequencies and extremely narrow (but mutiple) beams in the down scan/ side scan type transducers will be best for bottom detail at least in water that is shallow.

Higher frequency and narrower beam should give better bottom detail. The M is medium frequency and a medium to wider beam width of course so is not ideal for bottom detail.

Wider beam and lower frequency will result in a loss of detail.

Edit: as Abbor rightly points out the B175M is going to be better with bottom then the B75M so just because the B75M did not work as well does not mean B175M will not work better.
The B175M has more power, sensitivity and a narrower beam than the B75M so should give much better bottom definition.


Last edited by GregMachy; 01-27-2021 at 02:53 PM.
Old 01-27-2021, 02:06 PM
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B175M will give much better bottom detail than B75M due to narrower cone angle and higher sensitivity.
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Old 01-27-2021, 03:03 PM
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The words "shallow" and "deep" are subjective on this forum I've noticed when talking transducers.
Old 01-27-2021, 03:26 PM
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I see that the transducers are still sold with brand names associated with them, but I thought they all came with a 10m common wire now and if your unit doesn't take the common wire then you get a mx-n-match patch cord. Is that incorrect?

Bottom line: These two items will get me out the door with a B175H-20 and 10m of cable plus the required dongle to work with my Simrad NSS for a total of $733 + $83 = $816 plus tax, Correct?
https://www.hodgesmarine.com/airb175...RoCJiwQAvD_BwE
https://www.hodgesmarine.com/airmmc-...xoCAdAQAvD_BwE
Old 01-27-2021, 03:27 PM
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Originally Posted by one wolf View Post
The words "shallow" and "deep" are subjective on this forum I've noticed when talking transducers.
Fair point. Airmar specifically says the B175H is for down to 1,000 feet max, the M is 1,500.

So if the bottom is less than 1,000 it seems the H is probably better.
Old 01-28-2021, 08:20 AM
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Originally Posted by one wolf View Post
I see that the transducers are still sold with brand names associated with them, but I thought they all came with a 10m common wire now and if your unit doesn't take the common wire then you get a mx-n-match patch cord. Is that incorrect?

Bottom line: These two items will get me out the door with a B175H-20 and 10m of cable plus the required dongle to work with my Simrad NSS for a total of $733 + $83 = $816 plus tax, Correct?
https://www.hodgesmarine.com/airb175...RoCJiwQAvD_BwE
https://www.hodgesmarine.com/airmmc-...xoCAdAQAvD_BwE
I will call hodges to confirm but does this sound right to the brain trust?

Is there a THT sponsor I should contact instead that is price competitive and supports this site? I'm all for that.
Old 01-28-2021, 10:01 AM
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Good thread! Thanks for the info!
Old 01-28-2021, 10:54 AM
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Originally Posted by one wolf View Post
I will call hodges to confirm but does this sound right to the brain trust?

Is there a THT sponsor I should contact instead that is price competitive and supports this site? I'm all for that.
Simperfishing usually the best price you can find.
https://www.thehulltruth.com/semperf...cer-sales-135/
or The GPS Store
Old 01-28-2021, 11:43 AM
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The GPS Store's price is $1050 for the unit alone, no dongle, I was surprised. I'll ping Semperfishing.

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