Sounder vs Gopro images

I have been doing a bit of gopro videoing to compare with sounder images lately. A lot of learning and trying to document where I can. After reading a lot of sounder how to's I questioned with some of the things stated, which I'm trying to prove with the footage. Anyway I thought a couple of people could be interested and I could upload things as I learn, or with a PM I could share more. I had transfered my old images to an SD card but they got corrupted so I only have the last couple of sessions now! Ended up c/r about 14 dhus over the last two days, one went 10kg but the rest all arond the 6kg and under mark. Most were on a new 300g jig which goes against what a lot recommend, but helps tracking the boat with a resonable drift so you end up covering more fish. Put in a couple of other screengrabs from the last couple of sessions.

Image Upload: 

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 Thats  awsome too see  

Sun, 2018-06-03 19:02

 Thats  awsome too see 



getting the bottom line final answer from a bunch of blokes that use false names and put smiley faces at the end of paragraphs is not the best place in the world to get the information you seek.

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Date Joined: 17/06/10

Many thanks for the sounder shots

Sun, 2018-06-03 19:03

Thank you for the sounder shots and the explanation with them these sorts of things are a great educational tool and are much appreciated.

Stevo81's picture

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 Interesting mate, cheers  

Sun, 2018-06-03 20:00

 Interesting mate, cheers 



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Vinesh87's picture

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 Awesome! When was this

Sun, 2018-06-03 20:07



When was this picture taken, wouldnt mind diving that ledge!!

backlash's picture

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Sun, 2018-06-03 22:57


very interesting !

ranmar850's picture

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I used to dive a lot

Mon, 2018-06-04 06:52

 As someone who was both a diver and a fisherman--who dived on his own snagged pro pots for years--- it was always interesting to compare what you were seeing on the sounder with what you actually saw--I learnt a lot that way. I find your use of A-scope interesting. A-scope is not new, IIRC it was introduced in the early nineties on the pro gear we were using. We all  tried it, most discarded it. Summary of opinion  seemed to be that it may have had some value on the huge areas of general flat ground out in the 20's ( 40m or so) south of Gero and off Dongara  where it all looks much the same--some blokes reckoned they could pick up differences, instead of just running them off in a straight lines, which was the traditional way. Ground like that is more cracks and crevices and little holes, than ledges.  The ground is different off Kalbarri, where I mostly worked.  Try just running them off in a straight line up here and you'll go broke quickly.

When I bought my last crayboat, the previous owner ( from Dongara) had it set up for A-scope, for working as described above. But they were looking at the tails on the a-scope, not that  echo on top, as you drop off the ledge. That is interesting, although I can see it anyway on the conventional picture--the green on top corresponds with where the red drops suddenly then fills in with green and yellow above--classic ledge.  

Bottom lock on the Raymarines ( and Lowrance and Simrad, from what I've seen) is not the same as bottom lock on the JRC and Simrad, and Furuno, stuff we used to use. With them, it was a dead straight line, and you were looking for stuff that popped above it--deadly for deep water fishing off here. Game changer. These new machines are different, doesn't seem to work the same.

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Mon, 2018-06-04 06:58

thanks for posting.

ill grab those Crays for you if you want them  

gruntre69's picture

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 Great info, strange water

Mon, 2018-06-04 07:13

 Great info, strange water temp though. Seems like it's reading air temp on a hot day.. 


 Marine trimmer NOR (available for clears, tops, carpet, upholstery, custom equipment covers)

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Mon, 2018-06-04 08:34

Thanks for posting mate - those jigs seem to be working a treat!

Tom M's picture

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 Excellent read, looking

Mon, 2018-06-04 10:14

 Excellent read, looking forward to future posts,  like Ranmar it definately helps you understand the bottom when you have dived on it for years.


Tom M

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Good work.

Mon, 2018-06-04 11:12

 Thanks for sharing. Thats pretty subtle bottom. How do you reckon you would go finding that ground without the pots marking it for you?

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Mon, 2018-06-04 11:15


ranmar850's picture

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That shouldn't be hard to find

Mon, 2018-06-04 13:29

  Thanks for sharing. Thats pretty subtle bottom. How do you reckon you would go finding that ground without the pots marking it for you?

It looks to be just over a metre  high? You will get longer strokes when you come off broken sandy bottom onto reef, and if there is actully a ledge there, rather than a hard rock face with nothing under it, you get that distinctive flare of colours, as he is demonstrating on those shots--it will often seem to undercut the red on the echo, very distinctive. I haven't saved a lot of screenshots on my new sounder, but I have one that shows it a bit. coming up from 17 fathoms   onto 15 fathoms, you can see the ledge on the outside edge on the bottom LHS of the shoot. As it rises and the strokes get longer there is a mixing of colours , the red is shot through with others colours--this is the echo being bounced around and coming back a bit slower and weaker.





this isn't a really good example, it can be a lot more pronounced, even at well over 40 metres, although the effect does diminish as you get deeper, and it becomes more a matter of just the longer strokes. In this case , if you are showing enough screen to get a second or even third echo up, you will see the second echo tails get longer, as the first echo does, and the third echo might actually almost disappear. Unless the lump is just dead hard rock, in which casethere will be a strong third. Most users these days won't be showing enough screen to see this, particularly if they are just looking for fish.

TF in DZ's picture

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Really Interesting

Mon, 2018-06-04 14:04

Thanks for taking the time to post up your explanations Son and Ranmar

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Mon, 2018-06-04 14:38

 thanks for the post, great reading