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Thru hull for 20-100 ft

Old 07-16-2014, 06:46 AM
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Default Thru hull for 20-100 ft

I have a 1040xs and I'm ready to pull the trigger on a new thru-hull transducer.
I've read several other threads about the optim transducer but I have several other questions

To summarize, if I understand correctly the B150m is more economical than the B175H and does pretty close to as well in the depths I'm talking about (I assume this applies to salt water too)

Does the b150m have the same beam width as the B175h or not really?
Also, is there a distinction between B175h and B175w? I am not seeing anything listed as B175w online except for on this website.
Third, I assume B175L is more for deeper water, correct?

Last edited by jdon; 07-16-2014 at 05:17 PM.
Old 07-16-2014, 06:55 AM
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The B175 is for deeper water but you will benefit in any depths by the increased 1kw sensitivity. Beamwidth affects how much of the water column and bottom you see under the boat. If you are routinely in 20' of water you are not going to see much with a B175H. The beamwidth is just a little more than 6 degrees. The B175H-W is popular for fisherman like you in those depths that want the best performance. It has a beamwidth of 25 degrees so you see more than 4 times of what's under the boat.

The B150C-M would be the most popular for a fisherman like yourself to get performance that is hardly distinguishable in those depths from the B175C-W to the rec angler, and costs a lot less. Here are links to them all:

Garmin B150M -

Garmin B175C -

Airmar B175H-W -

You'll need this adapter with the Airmar Wide Ducer -
Old 07-16-2014, 07:04 AM
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thanks! And what is the beam width of the B150M? (I see 26/17 on the website but I'm not sure what that means) I suppose if that is remotely close to the B175H-W then it is a pretty clear choice. Either way if it is 17 degrees even that might be close enough
Old 07-16-2014, 07:33 AM
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You mention the B175 is a 1kw, but isn't the 1040xs CHIRP only 600w?

I will be upgrading to 741xs and a 1040xs this fall and I kinda have same question as the OP. I was wondering of the B150 will work good enough for me and spending the savings from a B75 or B175 and get the GCV10? How are the tilted elements running at 25 mph?

I fish Freshwater, Lake MI trolling 2-3 mph, 5-200 FOW is common, I do make 20 mile offshore runs to 500-570 FOW, but mainly fishing top 75 FOW. We fish suspended salmon, no bottom jiggin'.Pursuit 3000 Offshore twin IB.

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