What is it...?? (Hint...there's several of these in KY Lake)...
Attachment 272453
(Sonar quiz #3 willl be why the above image shows like that) ...
Rickie
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What is it...?? (Hint...there's several of these in KY Lake)...
Attachment 272453
(Sonar quiz #3 willl be why the above image shows like that) ...
Rickie
:crazy:I think I no,but I'll wait
Another hint...
This snapshot was taken from my 1197c SI ...(the DI in my SI unit is from the SI piezoes so this structure was actually in my SI beam)..
Rickie
Is that really the top of the structure or is it just as far up as the 800khz will show
Quote:
Originally Posted by kosmo
I'd assume it's the limit of the beam. Notice how you can see the waves on top as the beam moves up and down with the boat.
I'm curious if the left side of the image is downstream.
You guys are on the right track...and you actually answered Sonar Quiz #3...
Here's the depiction I drew up showing how the 800kHz (130° total coverage SI beams) scan a very tall structure...
Like kosmo and CatFan deduced...the uppermost part of the bridge piling is above the "reach" of the 800kHz SI beam... And the fact that the piling is approximately 10ft away from the xducer before the SI beam even hits the piling ...
Attachment 272455
(And the left side of the DI image is "downstream" ...as you can see the catfish hiding behind the piling in the eddy created by the bridge piling)...
Attachment 272454
Great sonar sleuthing guys ...
Rickie
So if you had been on 455 would it have shown all the way to the top? I never would have thought that thing stuck out of the water as tall as it does.
Rickie,if you had it on 455 it still would not have appear to go to the top of water even though it would have been at the top,what i am saying is the distant you are away would show up as depth in water,like 15 feet away would show up as 15 feet deep ,right? Just would not been wavy at top?
I'm pretty sure this is correct even tho I haven't scanned the piling with the 455kHz...which is on my list "to do" when I get back to the piling...Quote:
Originally Posted by genec
I guess I should have added that in the depiction somehow about how distance to the piling also shows as depth in a "DI from SI" image in the HB SI units....(so it's probably a combination of both beam reach and distance to the piling that makes the structure "not look right")...
Rickie
That's what I was going to say ...:notworthyQuote:
Originally Posted by rnvinc
This is very interesting. I would love to see more of this type of thing!
I'm looking thru my old snapshots and recordings to see what else I can quiz at you guys...Quote:
Originally Posted by Kenny
Stay tuned...
Rickie
This is amazing. Just think how much I would know now, if I found this forum 2 years ago. Thanks for all your great help. I really hate using an expensive fishfinder just as a depth and temperature reader! We just moved from the 898 to the Onix. Would the interpretation for SI/DI scans be the same?
Catfan hasn't posted all of the Sonar Quizzes in the Big Sonar Quiz thread yet ...Quote:
Originally Posted by jym
You can Search Sonar Quiz at the top right of the page to get them all ...
Rickie
Jimmy Hoffa resting place !!!!! :)