Sonar quiz #8

**toofuss** · 05-13-2014, 09:23 PM

That's interesting. I still have a hard time coming back but my units are only 5xx units so I don't have the high end antennas like some of the bigger ones.

**brettw** · 05-14-2014, 08:41 AM

Good quiz

**Redge** · 05-14-2014, 09:20 AM

Very nice Rickie, and I did learn something! Will have to try it tomorrow. I only get to fish on the weekends and the finders are at the lake. I will follow up with my experiment, seems I might not have to be as picky as I have been about placement.

I enjoy the Quiz posts, keep it up!

**GroutScout** · 05-14-2014, 04:20 PM

Originally Posted by Redge

Very nice Rickie, and I did learn something! Will have to try it tomorrow. I only get to fish on the weekends and the finders are at the lake. I will follow up with my experiment, seems I might not have to be as picky as I have been about placement.

I enjoy the Quiz posts, keep it up!

Please do post what happens, I'm quite curious if it makes a difference.

**kickingback** · 05-18-2014, 11:24 AM

You still may not get the EXACT same gps coords if you go back and forth over the structure as the structure could be a few feet wide. If you go back and forth over the structure you may mark a few feet over from your last mark but it looks the same from DI. I have been on structure that was over 20 ft long and had three separate coords marked on it and it looked almost the same each time.

I win!

**jerryT** · 10-10-2015, 03:12 PM

Originally Posted by brettw

Guessing no.1
Bottom of pile is best as top may be leaning, for instance , a tree,

Number one is the most accurate, therefore should be used. However, the difference in distance is because the tree, or brush is leaning away from the boat at the same angle as the curser was generated, and the operator should be able to fish the object from any of the marks, but the number one and two would be more accurate.

jerryT, (the new egg in the nest)

**rnvinc** · 10-10-2015, 09:26 PM

Originally Posted by jerryT

Number one is the most accurate, therefore should be used. However, the difference in distance is because the tree, or brush is leaning away from the boat at the same angle as the curser was generated, and the operator should be able to fish the object from any of the marks, but the number one and two would be more accurate.

jerryT, (the new egg in the nest)

The answer is in post #19 ...
http://www.crappie.com/crappie/side-...ml#post2686994

All 3 cursor positions (when marked in a direct vertical pixel row in the 2d image) will have the exact same latitude and longitude coordinates ...

This is because the unit records and assigns the current GPS coordinates to each "entire vertical pixel row" of echoes as it is "painted" into the 2d image at the very right-most of the screen ...and because that "set" of coordinates is assigned to that vertical pixel row = those assigned coordinates follow that vertical pixel row all the way thru the visible sonar history ...

Freeze the 2d image screen scroll and test ...

Rickie

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