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School me on side scan sonar

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Old 08-04-2018, 07:57 PM
  #21  
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Originally Posted by kmoose View Post
My earlier post was right at 20 knots. Range settings at speed need to be set around 2x the depth with no more than 3 times max. Way too many folks run their range too far out and think there is a problem with their unit. It is very hard for a unit to process so much data at speed but in all reality I can see structure on your screen shot just fine but there are no range markers for reference.
2x the depth on each side of the boat? (50ft deep, 100ft wide to the left and 100ft wide to the right)

Or 2x the depth total width scanned? (50ft deep, 50ft to left and 50ft to right)
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Old 08-05-2018, 05:11 AM
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Just install it on my new to me boat. My old boat had it and really I liked it.

It works best at slow speed (4-5 knots). Some people swear by it - some don't. I do. To me it's a must have.

Best I can tell you is go on a boat that has it and then just use up down. I went with a Lowrance HDS Gen 3 9. It's a very good value - bought it off overtons for $1000. (included 20% off coupon). I use it to spot fish, groups of fish, and bait. Have yet to cruise deeper water using it, but will shortly.
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Old 08-06-2018, 04:53 AM
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CV51M-THP, 7612XSV

The side scan works good below planning speed. Mainly use it when on a mark or trolling.

The traditional chirp, I have it reading bottom while on plane after playing with some of the settings. It holds bottom at our cruising speed of 34 MPH. Still has noise but much better than before.

Traditional chirp - when off plane and searching with smoothing off, interference low, TVG low, color limit set in the middle, scroll speed fast, pic advance 4:1, surface noise off, zoom set to bottom 20', echo stretch set +3, I can get a beautiful images but the fish arches a not pronounced.

Any tips?
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Old 08-06-2018, 02:20 PM
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In general, are most people seeing better images with a thru-hull ducer, vs transom mount?

Also I would think a transom mount transducer would foul quickly on boats kept in a slip. Do people find that is true?

Last edited by c1steve; 08-06-2018 at 02:37 PM.
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Old 08-07-2018, 11:10 AM
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It's not a screen shot but this GT51M-TH marked fine at 48+. The High Chirp through the GSD-26 is a tank mounted R599LH shooting through a vacuum bagged "pane" of glass in the cored hull bottom.

Last edited by bills106; 08-07-2018 at 11:18 AM.
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Old 08-07-2018, 03:19 PM
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Originally Posted by c1steve View Post
In general, are most people seeing better images with a thru-hull ducer, vs transom mount?

Also I would think a transom mount transducer would foul quickly on boats kept in a slip. Do people find that is true?
I've never had trouble with stuff growing on my transom mount 'ducer. Not sure why but nothing seems to grow on it
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Old 08-07-2018, 03:44 PM
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Originally Posted by bills106 View Post
It's not a screen shot but this GT51M-TH marked fine at 48+. The High Chirp through the GSD-26 is a tank mounted R599LH shooting through a vacuum bagged "pane" of glass in the cored hull bottom.
With regard to the side imaging screen in that shot, remember that the image at the bottom of the screen is historical, with new data at the top. So there's a good image at the bottom maybe when the boat was off plane, then the turbulence starts just above the middle of the screen as the boat gets on plane, and then it goes dark near the top. That's my guess anyway. I'd like to see more if you can get it, including what the installation looks like.
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Old 08-07-2018, 04:11 PM
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Old 08-08-2018, 08:47 AM
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Originally Posted by dove72 View Post
With regard to the side imaging screen in that shot, remember that the image at the bottom of the screen is historical, with new data at the top. So there's a good image at the bottom maybe when the boat was off plane, then the turbulence starts just above the middle of the screen as the boat gets on plane, and then it goes dark near the top. That's my guess anyway. I'd like to see more if you can get it, including what the installation looks like.
That shot was taken in the middle of a long run at speed and the brief washout on the GT51 was caused by a pretty hard banked turn but it cleared up once she got back closer to level. The R599 though never lost bottom which was a little surprising to me at that speed and considering she has bottom paint. There was also a lot of depth changes and all of the sounders were on auto so they were constantly adjusting ranges which could be a reason for the changes too. I've got some video's of that run, will see if I can upload one of them.



The ducers are both located under the cockpit deck, you can see the GT51 in this shot if you zoom in just to the port of the keel and the R599's tank is just forward of it, (first shot looking aft).
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Old 08-08-2018, 09:25 AM
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Very nice setup and install. Please post some more screen shots when you can get them, especially as you increase the range on the SideVu.
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Old 08-08-2018, 11:51 AM
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Originally Posted by dove72 View Post
Very nice setup and install. Please post some more screen shots when you can get them, especially as you increase the range on the SideVu.
Thanks, I don't have any deeper SideVu shots from that boat other than some test runs on the river. Only got one trip in offshore and was too busy catching fish to do much experimenting with electronics but where she is the bottom drops quick (surprised no one mentioned the lat/long on the plotter!) so we were deeper than the GT51's capability in literally minutes running offshore. Planning on a return trip in October and will save a bunch of screen shots then.
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Old 08-08-2018, 11:58 AM
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Lowrance/Simrad TotalScan > Garmin SideVu
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Old 08-10-2018, 04:21 PM
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We went offshore yesterday afternoon. I have a GT51M-TM and a 1042xsv. I just left a wreck and was headed to one about 2 miles away. I made it about 500yds when I noticed a hump on my traditional chirp sonar. Well I had my sidescan on and I also saw the same hump on the sidescan. I circled back around and got on the wreck. It had a ton of fish on it. I didn't think about it at the time but I was running 25mph when I saw the wreck on both traditional and sidescan. Wish I had taken a screenshot. Needless to say I will keep my sidescan on now when I'm running from spot to spot.

Last edited by mdees88; 08-10-2018 at 04:48 PM.
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