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Thread: Sonar displays @ 40 times per second. How fast do I go to see the bottom at realtime?

  1. 07-15-2007, 12:15 AM #1
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    Default Sonar displays @ 40 times per second. How fast do I go to see the bottom at realtime?


    What I mean is the info says my 565 returns realtime signals @ 40 times per second. What is my top speed before I get ahead of the returns?
    Yall math guys might can help me..one reason I quit doing electrical work..I hate E= I x R...
    thanks
    Smitty

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  2. 07-15-2007, 12:03 PM #2
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    I don't know if this answers your question or not but its interesting reading.
    http://www.wmi.org/sql_messages_html...ni&num=13024#2
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  3. 07-15-2007, 08:57 PM #3
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    Hey Smitty,

    At 60 mph you move 1 mile per min

    At 60 mph you move 88 feet per second

    You are getting 1 echo return every 2.2 feet you move. (88 divided by 40)

    Will your boat run 60? I would say your are safe to go this speed.
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  4. 07-15-2007, 09:49 PM #4
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    thanks I'll never out run it then.
    Ok I get that...now one more. What I want to figure is does the display keep up with the entire, unbroken bottom.

    It just doesn't look like I am getting every contour. It never goes blank is a perfect working 565. I think it is just me.

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  5. 07-16-2007, 12:22 AM #5
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    The other thing I wonder about is chart speed. How do you know if the chart speed is keeping up with how fast you are going, as it doesn't speed up when you do.....

    Might be stupid, but I'm wondering.
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  6. 07-16-2007, 09:00 AM #6
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    Quote Originally Posted by pstone
    The other thing I wonder about is chart speed. How do you know if the chart speed is keeping up with how fast you are going, as it doesn't speed up when you do.....

    Might be stupid, but I'm wondering.
    I am not an expert on sonar, but several things come into play here.

    1. depth of the water
    2. viscosity of the water
    3. unit ping rate and also pulse width of ping
    4. transmit/receive frequency
    5. transmit power of the unit
    6 quality of the unit.

    I am sure there are other factors, but these are the key players. Usually a newer cheap unit will work up to about 70 MPH. This is what I have read and have been told these facts by the experts.
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  7. 07-16-2007, 07:42 PM #7
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    well me little turd bucket does a bout 30 top end empty, downstream and downwind.. Thanks for the info yall.

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  8. 07-16-2007, 07:46 PM #8
    guest01
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    falconsmitty is yours a dual beam? if it is you will get better bottom detail if you keep it set on your narrow beam
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