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catman5339 12-01-2017 02:11 PM

Inshore fishing: Down scan or side scan beneficial?
I'm new to inshore fishing and am considering a Garmin Striker Plus 7sv or an Echomap Plus 44 cv. But I'm not sure what depth is necessary for down scanning or side scanning to be beneficial or even accurate? Or is the mapping function with the Echomap the most useful of all. Any advice would be helpful. Thanks.

semperfifishing 12-01-2017 02:46 PM

Down and Side Scan is mostly used for location of structure and for bottom detail.
It's can detect some fish..but that is not as good as the traditional transducer elements.

Fortunately most units use both structure scan and traditional in one transducer.
Most Side and Down scan units work best in less than 150'...and at speed less than 10 mph.
Very helpful fro location of structure...and reducing search time.


treeguyus 12-02-2017 05:20 AM

Adding to Semper's comments, DS and SS will show some fish, like Semper says. Find myself using it less with a good 2D setup/chirp

catman5339 12-02-2017 01:33 PM

Is there a minimum depth for DS and SS, in particular, to be effective? I do want to identify rock piles and potholes among the mangroves and ICW in my area. Do I need DS & SS or a good mapping unit? Thanks.

mdees88 12-02-2017 06:17 PM

2 Attachment(s)
Sidescan is a must. I use it primarily offshore to locate artificial reefs and wrecks in 50-120ft of water. BUT.... I use it a lot in 20ft of water and less to locate brush piles for crappie fishing. It will make finding your rockpiles very easy. I had a Garmin 74sv and it performed very well. I never used any mapping features. I just ran around with sidescan until I found some structure then I saved it on the chartplotter.

Once you start using sidescan you will want to have your chartplotter set up in split screen. When I bought the 7" I thought it was huge. Unfortunately when running it splitscreen it's like looking at two different 3.5" machines. After owning the 7" I always tell people 9" is the smallest I would recommend if you plan on using sidescan, though the 7" did work. I have since sold my 74sv and bought a 1042xsv. MUCH better.....

If I were you I would be looking at getting an echommap or echomap plus 74sv or 94sv.

The sidescan will work very shallow. Here's a pic in 2.5ft of water. It clearly shows each bank of the very narrow creek I was in. It also shows a couple fish and a log on the bottom....

Attachment 1023910

Starplex 12-03-2017 01:44 PM

Agree with mdees. After learning structure scan it is a great tool to have. I like it much better than traditional sonar. I also, have a 7" and regret not going bigger.

offracing 12-03-2017 02:34 PM

I wouldn't have a machine without side scan, it helps me so much when the bait is not showing on the top, I can find my schools of menhaden off to the side and get a net on them

Rundeep 12-03-2017 03:14 PM

Side scan inshore is a must, Capt Blair Wiggins has video where he did a show here in Stuart and showed as he was passing dock piling it was picking up fish next to them.

catman5339 12-07-2017 11:14 AM

I think I am sold on the echomap 9sv. Anything more and I'm afraid the FF will be worth more than my boat. I am also not sure whether I would make use of the WiFi capability with the Plus version. Now to find a good deal. West Marine is running a deal with $200 off through 12/24. Anybody know of a better deal?

semperfifishing 12-07-2017 11:30 AM

If possible see if the West Marine close out units have the GT51 transducer..and not the cv51..

catman5339 12-07-2017 11:38 AM

What is the difference between a GT51 and a CV51 transducer? Thanks

RustyGaff 12-07-2017 12:45 PM

Originally Posted by catman5339 (Post 10906077)
What is the difference between a GT51 and a CV51 transducer? Thanks

Maybe Gil can chime in if I am wrong here. The Garmin GT51 is a 3 element TD. ( A down element and 2 side elements) There was some sort of patent infringement battle between Garmin and Lowrance/Simrad and Garmin subsequently pulled the GT51's off the market. They replaced them with the CV51 which only has 2 side elements which overlap the down scan for a synthesized down view. Hope I got this right.

mdees88 12-07-2017 12:47 PM

Originally Posted by catman5339 (Post 10906077)
What is the difference between a GT51 and a CV51 transducer? Thanks

This is my understanding....

The GT51 has a 600w traditional chitp element, 2 side scanning elements totalling 500w, and a downvu element at 500w.

Garmin got sued over the technology in this transducer. Then they started making the CV51.

The CV51 has 600w traditional chirp element, 2 side scanning elements totaling 500w, but has NO down facing element.

The two side scanning elements overlap to digitally produce a dowvu image. So the GT51 has a dedicated downvu element and should have a clearer, more accurate downvu image.

In traditional and sidescan the transducers should perform the same. Just in downvu, or clearvu, or bottom view (whatever they call it now) the CV might perform a little worse than the GT.

semperfifishing 12-07-2017 12:57 PM

Originally Posted by catman5339 (Post 10906077)
What is the difference between a GT51 and a CV51 transducer? Thanks
Here is a post about the GT series..vs cv units.

The GT 51 has a dedicated Down facing element for Down Vu (structure).

The cv51 does not have a dedicated down element but shares the side elements to producer a down scan.

oneoverpar 12-08-2017 09:28 AM

I also have the 7" and will upgrade soon to at least a 9.

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