Garmin images

Here are a few screen shots from a card I pulled the other day to back up waypoints. I am terrible about remembering to take any.

These are down imaging shots, maybe the worst of the big sonar companies but very functional.
https://uploads.tapatalk-cdn.com/201...2635bc9e67.jpghttps://uploads.tapatalk-cdn.com/201...2e94411bba.jpghttps://uploads.tapatalk-cdn.com/201...57def1ea72.jpghttps://uploads.tapatalk-cdn.com/201...84f64b8343.jpghttps://uploads.tapatalk-cdn.com/201...3e94b44df0.jpghttps://uploads.tapatalk-cdn.com/201...92d675ac89.jpg

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Here are a few side image shots, most are pallet style stake beds typical on Kentucky/Barkley. Not the greatest images but works for me running everything in auto except range.
https://uploads.tapatalk-cdn.com/201...95b50338b6.jpghttps://uploads.tapatalk-cdn.com/201...088dc4f0dc.jpghttps://uploads.tapatalk-cdn.com/201...28605b545c.jpghttps://uploads.tapatalk-cdn.com/201...69e0f25660.jpg

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Try 855 hz
Turn TVG off
Use zoom in side scan

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Nice pics pab1981. Mine are similar to your dv ones. Sometimes mine are a bit less sharp than I would like but I am at TM speeds also (< 1 mph). I am using 93sv chirp GT52HW. I stay at 455kh always it seems. Tried 800 but don't stay there. Some say it is better, but I must need to tweak something to get there, and so far I've not hit on it. Will keep trying. Good units, found a lot of cover, etc. Really like the sv for searching bp's Thanks for the pics

I have played with the 800 some on down and side. At times I thought I liked it better on side but never liked it at all on down.

What does turning off TVG do?

I have tried to use zoom, no luck I guess I need to read the manual again I always make a mess with it.

One of my favorite things about these units is how well they function without manipulating them. I get that you can get more out of them and am open to getting better with them if it relatively stress free but I am pretty happy as is other than mapping on Barkley. I am not going to guess how many hundred brushpile/stakebeds/trees I have found with them and have had a lot of success catching fish with them as is.



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TVG is Time Varied (or Variable) Gain. It's under MENU then SONAR SETUP then ADVANCED. Mine is at Medium. Guess it came that way. I am not sure what it does or doesn't do. Was under the impression it was only effective for really deep water, but IDK. Perhaps Machine will help us out on that.

I agree on finding so much cover that I never knew was there. Plus it is a very easy unit to work. I am more than satisfied. I found an old bp on a local lake last year that I fished when I was a teen. Not much left after another almost 60 yrs but two hollowed logs, but I found it. Nothing home tho.

Less than 50 feet or so

Turn it off

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Quote:

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Originally Posted by Machine

Less than 50 feet or so

Turn it off

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Less than 50 ft of depth (as in 2d) or range (as in sv)?? What does it do btw?

Seems to make image a lot cleaner

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Well, I will try it as it is easy enough to do. Still ask tho is this something best used in less than 50' sv range, or in less than 50' of water, both or etc??? If it makes the image cleaner then I may try 800 again because I didn't get nearly as good information back on it as I did 455. Or, I need to adjust something else to get it. I'm sure I won't grasp the technical reasoning behind TVG, but that matters not.

OK. Tried to read up on TVG. Raymarine had maybe the best source of info on it. Started off with 'a little-understood entity' on multi freq units. I agree. I'm gonna do it to mine. Simple to do, coupla clicks. Maybe I'll get to try it out today. My understanding is that it should allow better reading/display of near targets since we are not sending and receiving from far-off targets, therefore not needing the auto adjust for display of those targets. Also can clean up some near-surface noise, if present. Worth trying. Maybe this will make a diff on 800 for me??? Anyway, thanks Machine for the input.

Join the club

I'm learning also

Down scan is easy..

Side imaging is kicking our butt

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About time varied gain

Time varied gain (TVG) is signal compensation that removes transmission loss effects from echosounder data. Transmission loss is two-way and is due to acoustic beam spreading and absorption in the acoustic medium. Signal compensation is applied by the echosounder or by receiver electronics through analog or digital signal processing. The desired result is that targets of the same size produce echoes of the same size, regardless of target range.

The important part is the last sentence above ...meaning (in 2d) a 2lb fish at 10ft and a 2lb fish at 30ft create the same size target on the 2d display (adjusted by software - even tho the 2lb fish at 30ft has less echo because it was farther away) ...

Rickie

TY. I read similar data on a few places, caused as many questions as it answered for me. Appreciate your explanation and input. Was hoping you might come to the conversation. What is your position on using it? Or not. I know I am in less than 15 fow, usually have my sv on 40' range. Welcome your thoughts.

I cannot imagine why TVG has beneficial merit in shallow water situations (meaning I don't understand why the brands even input it in shallow water situations) ...

TVG was designed such that deep water targets (think ocean depths) were not painted as 1/4" long fish arcs while the same size target at 100ft we're painted as 1" long fish arcs ...

Now, what is not clear (even in my mind) is that the brands may be using the TVG technology (originally designed for deep water scenarios) in these shallow water scenarios for a result not even related to actual target echoes... But maybe as a filter of some kind for environmental anomalies ...

There are discussions in other forums describing the HB Surface Clutter setting being a sort of TVG technology ...

Rickie

I see a blob on the gps location. Needs fixin. Outside that, I mostly understand what is on the screens.

The best I did on side scan so far was when the walleye were spawning

I could go by a point and see them ,then stand up and spotlight to see for sure.

I have not used the blue color yet
In pics it looks best, but on the water I don't like it..

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I tried it with the TVG turned OFF yesterday. That didn't fly so well for me. Screen got very busy, not clear At all. Mine was originally on MED for whatever reason. Doubt I did it as I didn't know I owned it before this. Took it back to LOW. I need to ask do I need to make further adjustments now to Brightness and/or Contrast? I'll play with it, just wondering if there were suggestions as a starting point? Not discrediting the suggestions here, Todd D has also said that he sees little advantage for TVG being ON in freshwater, period. So, some knowledgeable folks are saying we don't need it. Steer me in the right direction for further set-up. Thanks

TVG is set to high on my 73sv in down and sideview.

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Originally Posted by FishinRanger

TVG is set to high on my 73sv in down and sideview.

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Interesting, and thanks for sharing. I wonder also is your water clarity quite clear, or like mine somewhat off-color? When the winds calm down I think I am going back to a higher setting again, as my picture was a lot less cloudy. I have been using 800 a bit more successfully. So we keep learning.

Water clarity here on Lake Hartwell is like an emerald green color. Not dirty or murky at all.

Here a couple more from the front unit, can't imagine how many more I could catch if I had top of the line imaging from Hbird or Lowrance.
https://uploads.tapatalk-cdn.com/201...6691ece80e.jpghttps://uploads.tapatalk-cdn.com/201...7868ac148e.jpg

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Quote:

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Originally Posted by pab1981

Here a couple more from the front unit, can't imagine how many more I could catch if I had top of the line imaging from Hbird or Lowrance.
https://uploads.tapatalk-cdn.com/201...6691ece80e.jpghttps://uploads.tapatalk-cdn.com/201...7868ac148e.jpg

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Would you mind sharing your settings please
I'm not there yet

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I just run in auto medium, don't adjust anything, I played some at first but happy enough with the data I get from the factory auto adjustments.

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pab1981, which Garmin are you running? On the first page you were showing a GT52HW and here it is GT22HW. I have GT52HW on a 93 chirp. Happy here.

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Originally Posted by pab1981

I just run in auto medium, don't adjust anything, I played some at first but happy enough with the data I get from the factory auto adjustments.

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You use Auto in speed setting?

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Yes I am

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Quote:

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Originally Posted by pab1981

Yes I am

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Have you tried ultrascrol?


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Nope, I haven't that I can remember. I am kind of a if it isn't broke don't fix it kind of guy. I have a very high percentage of catching limits running the units just like they are and a lot of those were produced from covering fresh ground with these units, not really inclined to play a whole lot with them. I also don't update my software unless I have a problem with a unit or hear an update has something I have to have. Haven't updated either unit to date.

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Quote:

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Originally Posted by pab1981

Nope, I haven't that I can remember. I am kind of a if it isn't broke don't fix it kind of guy. I have a very high percentage of catching limits running the units just like they are and a lot of those were produced from covering fresh ground with these units, not really inclined to play a whole lot with them. I also don't update my software unless I have a problem with a unit or hear an update has something I have to have. Haven't updated either unit to date.

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In shallow water the blue works well

In normal the Amber looks best to me

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