Thread: Sonar quiz #8

Below are 3 screenshots of the very same brushpile...(I froze the screen scroll and captured all 3 screenshots 1 after the other)..

Each screenshot shows the cursor position in a different spot on the display...

Which cursor position would make the most accurate waypoint in relation to the actual brush pile...??

And explain why...
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Screenshot 1...:



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Screenshot 2...:



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Screenshot 3...:



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Rickie

I'm gonna say #2 because its the highest thickest part of the pile

I am going to say #1 because it seems to work for me. I think ! Looking forward to the real answer with an explanation. Always up to learn something new!!

All of the above

Originally Posted by kosmo

All of the above

I'm with you, Koz .... seems like the cursor is in exactly the same position (vertically, in relation to the screen), just in three different parts of the water column ... which the GPS isn't reading, anyway, as it's reading where the antenna is. Shouldn't matter where the cursor is (water column depth) for a 2d screen ... since the "brushpile" showing on the screen is locked onto by the GPS antenna, and all three cursor positions are in exact vertical alignment ... so it would seem like the GPS coordinates would be exactly the same.

... cp

My reason is, because that is where the brush pile actually is on the lakebed. I find it interesting to mark three places when I find something new. I mark one in SI and normally one or two on the DI screen. It is amazing to see how far apart they can be, on the map!

#1...

Someone try it for yourself...and then come back here with your results...

And then we will discuss why this result happens like this...

Rickie

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

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)