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Transducer selection help?

Old 11-13-2016, 12:37 PM
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Default Transducer selection help?

Hello everyone, first post here. Great forum - I've been reading a lot and I'm learning a lot. I am looking for some advice on transducer selection.

Boat is a brand new Grady White Freedom 307. No electronics yet. We negotiated in the boat deal two Garmin EchoMAP 7612 MFDs (one 7612xsv and one 7612) and one Garmin GT50M-TH.

Average ocean fishing depths will be around 100ft - wrecks and artificial reefs. However, with this boat we'll probably venture out deeper here and there. We also fish the bay and river where depths can be anywhere from 3-20ft.

It's important for us to see bottom, to identify the structure, and to see fish in detail. For safety, we also want to keep an eye on depth when cruising in the shallows in the river and bay.

I want to make sure the GT50 is a good selection for our needs...before it's too late and installed. The electronics installer suggested we go with a B60 in addition to the GT50 because he said the B60 holds bottom better and is faster, and is more accurate in shallow water (under 10ft).

Does anyone have any thoughts or recommendations? Thank you in advance!
Old 11-13-2016, 01:16 PM
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Instead of the B60..I would suggest the B75 H (For bottom detail) or M ( For targets in the water column)
Old 11-13-2016, 01:25 PM
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Originally Posted by semperfifishing View Post
Instead of the B60..I would suggest the B75 H (For bottom detail) or M ( For targets in the water column)
Thank you, sir. So do you agree that the GT50 alone is insufficient? I should definitely couple it with a traditional transducer?
Old 11-13-2016, 02:01 PM
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Originally Posted by Panabal View Post
Thank you, sir. So do you agree that the GT50 alone is insufficient? I should definitely couple it with a traditional transducer?
You can start with the GT50...but you might also consider the GT51..since you think you may fish some deep water later.

the G|T50 has a 300 traditional CHIRP element..the GT51 has a 600 watt traditional CHIRP element.
Old 11-13-2016, 02:47 PM
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Originally Posted by semperfifishing View Post
You can start with the GT50...but you might also consider the GT51..since you think you may fish some deep water later.

the G|T50 has a 300 traditional CHIRP element..the GT51 has a 600 watt traditional CHIRP element.
But definitely couple the GT50 or the GT51 with the B75? Meaning, one of the GTs alone won't suffice for what I'm looking to do?

Thanks again, and sorry for all the rookie questions.
Old 11-13-2016, 05:20 PM
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You mentioned you were going to go with a thru hull GT50...and then possibly add a B60.

My thought is if you go with a GT51 thru hull then you will have a very good 600 watt traditional CHIRP element.
And that may be all you need.
Old 11-15-2016, 10:09 AM
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Gil...

How do you feel about coupling the GT51 with a B175HW for our needs:

Average ocean fishing depths will be around 100ft - wrecks and artificial reefs. Perhaps deeper here and there. We also fish the bay and river where depths can be anywhere from 3-20ft. It's important for us to see bottom, to identify the structure, and to see fish in detail. For safety, we also want to keep an eye on depth when cruising in the shallows in the river and bay.

Also, can the GT51 CHIRP down be run at the same time the B175HW is run on a separate MFD? I'm wondering if there will be interference as the GT51 CHIRPs at 80-160 kHz and the B175HW CHIRPs at 150-250 kHz. Looks like there is 10 kHz of cross over. I'm not sure how that affects the return signal.

Thanks again!
Old 11-15-2016, 11:10 AM
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Originally Posted by Panabal View Post
Gil...

How do you feel about coupling the GT51 with a B175HW for our needs:

Average ocean fishing depths will be around 100ft - wrecks and artificial reefs. Perhaps deeper here and there. We also fish the bay and river where depths can be anywhere from 3-20ft. It's important for us to see bottom, to identify the structure, and to see fish in detail. For safety, we also want to keep an eye on depth when cruising in the shallows in the river and bay.

Also, can the GT51 CHIRP down be run at the same time the B175HW is run on a separate MFD? I'm wondering if there will be interference as the GT51 CHIRPs at 80-160 kHz and the B175HW CHIRPs at 150-250 kHz. Looks like there is 10 kHz of cross over. I'm not sure how that affects the return signal.

Thanks again!



If you were to use the B175HW...I would probably use the GT41 instead of the GT51...as it has the same side and down scan elements as the GT51......and a 50/200 600 watt traditional elemetn.

Use the side and down scan for reefs and wrecks..the B175HW for targets in the water column.

But...

The GT51 by itself may be all you need for your depth and needs.
Old 11-15-2016, 11:43 AM
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Originally Posted by semperfifishing View Post
If you were to use the B175HW...I would probably use the GT41 instead of the GT51...as it has the same side and down scan elements as the GT51......and a 50/200 600 watt traditional elemetn.

Use the side and down scan for reefs and wrecks..the B175HW for targets in the water column.

But...

The GT51 by itself may be all you need for your depth and needs.
Ahh, so with the B175HW, you would prefer the 50/200 @ 600W traditional over the 80-160 @ 600W CHIRP? Why is that? More range and the ability to go deeper (50 kHz) or some other reason?

If I've activated the B175HW (150-250 kH) on one MFD and also activate the GT41 in high (200 kHz) on another MFD, will there be interference issues as there is crossover?
Old 11-16-2016, 07:39 AM
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Originally Posted by Panabal View Post
Ahh, so with the B175HW, you would prefer the 50/200 @ 600W traditional over the 80-160 @ 600W CHIRP? Why is that? More range and the ability to go deeper (50 kHz) or some other reason?

If I've activated the B175HW (150-250 kH) on one MFD and also activate the GT41 in high (200 kHz) on another MFD, will there be interference issues as there is crossover?
I think he meant to switch to the GT41 to save money as you will only be using it for its DownVU/SideVu elements. Traditional sonar will be handled by the B175.
Old 11-16-2016, 08:06 AM
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Originally Posted by Amity83 View Post
I think he meant to switch to the GT41 to save money as you will only be using it for its DownVU/SideVu elements. Traditional sonar will be handled by the B175.
Perhaps, but it's only about $100 difference between the GT51 and the GT41. Wondering though if alongside the B175HW, the GT41's 50/200 @ 600W traditional sonar is preferable over the GT51's 80-160 @ 600W CHIRP sonar.
Old 11-18-2016, 08:12 AM
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The 200kHz small cone might be better for bottom resolution than the 175HW and 51M, but your downvu is going to be good for that as well. For fish, your 175HW is going be way better.
Old 11-18-2016, 08:20 AM
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Originally Posted by Amity83 View Post
I think he meant to switch to the GT41 to save money as you will only be using it for its DownVU/SideVu elements. Traditional sonar will be handled by the B175.
Old 11-18-2016, 08:52 AM
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Great, thanks guys. Based on these recommendations, we're going to go with the GT41 and the B175HW.

I imagine it's not possible to fire both transducers off the one 7612 at the same time, is it? For instance, have the 7612 fire the GT41 in downvu/sidevu and also the B175HW at the same time?

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