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  1. #1
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    Question Understanding Side scan WP placement




    In the screen shot, We ran over something that I wanted to mark. I thought they might be fish, but we didn't catch so I can't confirm.

    Since we split the objects between left and right, that should mean we ran almost directly over them. I do see that they are probably more to the left of mid since the return is stronger on that side. I placed WP 355, 356 and 357 in a line to mark it.

    Out of curiosity for this question session, I marked 359 and 358 on the fish, left and right of center.
    Then out to the side I marked a stump/log (360).

    1. Am I marking it wrong with 357, 358, and 359?
    2. If you look at the map in the top right, you see that 359 and 358 (blue line) are out to the side in either direction. If the fish are relatively close to being directly below, surely they aren't out 20' (as this is the depth) in either direction. What is going on here, I would expect that 359 and 358 be directly under the boat, or fairly close to it?
    3. Is WP 360 actually 40 foot from 359 (green line) and 60' from the transducer?

    I may be over thinking it. Maybe I should be accepting that the software is capable of doing the math and marking what I see accurately, but it throws me off with how 358/359 is shown to either side of 356 in the map. I just want to trust the WP placement and then be able to hit it.

    Last edited by Jethreaux; 02-12-2018 at 10:25 PM.

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  3. Member WB's Avatar
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    #2
    20 feet is a boat length
    .

  4. Member
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    #3
    Quote Originally Posted by WB View Post
    20 feet is a boat length
    .
    unless its a 20' 11" boat, then its almost a foot short.

    20' off can be make or break on a spot. In this case, it could be almost 40' between 358 and 359

  5. Member
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    #4


    Don't have the answer, but I'm wondering the same thing.

    I often mark spots and it may say they are 40', 60', 80', 90' out to one side, maybe in 15'~20' of water.
    Yet I know ABSOLUTELY that 80' out (if not 60') and it'll be up on the darned BANK! (Or at the very least in 12"~18" of water.)
    Later,

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  6. Member
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    #5
    Photobucket may have been a bad choice...recommendations for an image host to use that won't stop the screenshot from showing?

  7. Member
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    #6
    I don't know if I'm doing it right, but when I see something in the "water column" on side scan, then I mark the WP on my 2d or di screen (I always run one of those along with si). My thought is that would be directly under the boat and not off to the side. Can't see your image though so don't know if that would make it any different or not?
    1998 Tr-21, 2001 Yamaha 225 OX66

  8. Member
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    #7
    Quote Originally Posted by Jethreaux View Post
    Photobucket may have been a bad choice...recommendations for an image host to use that won't stop the screenshot from showing?
    I corrected it with google drive, by creating a drive direct link and embedding it with the HTML editor...long story, but better than using stupid photobucket.

  9. Member
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    #8
    Quote Originally Posted by rat0502 View Post
    Can't see your image though so don't know if that would make it any different or not?
    You should be able to see it now.

  10. Member
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    #9
    Did I put this in the wrong forum? it's been *crickets* in here...

  11. Member
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    #10
    This is how I read the waypoints. 355,56 and 57 are under the boat. 359 and 358 are 20ft to each side of the boat. 360 is 60ft from the boat and 40ft from 359. The range marks are not showing anything for depth but rather the distance out to the side of the transducer.

  12. Member
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    #11
    I see 355 356 357 directly under the boat 358 is 20ft to the right of your boat. 359 is 20ft to the left of your boat and 360 is 60ft to the left of your boat and 40ft from wpt 359

  13. Member
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    #12
    Sorry i just read Indiana01 post and realized he said the exact same thing..