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    6/30/2020 7:29 am  #1

    prcopeland
    Expert

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    Registered: 2/02/2019
    Posts: 16

    Ground Wind

    Hi,

    Does Expedition compute or log "ground" wind direction. I have a B&G instrument system - and am sailing in an area with strong currents. I am seeing a 10 to 15 deg swing in both TWD and TWA when I tack.  Wound be super handy in analysing what's going on to have both TWD and Ground Wind logged. (Right now TWD seems to being caculated by B&G relatiive to boat Heading - not COG.)

    Thanks

    Phil

     

    Last edited by prcopeland (6/30/2020 7:31 am)

     

    6/30/2020 12:22 pm  #2

    Nick
    Moderator

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    Registered: 9/16/2015
    Posts: 2,764

    Re: Ground Wind

    Yes, Exp does calculate GWD and GWS, but you want to use TWD to correct your winds, as in the B&G manual.

     

    7/01/2020 12:06 pm  #3

    Campbell_Field
    Moderator

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    From: UK
    Registered: 9/16/2015
    Posts: 211

    Re: Ground Wind

    Your swinging in TWA/TWD has nothing to do with current - since the current is consistent from tack to tack.

    Sounds like you need to check your TWA cal, but before you do that too much verify your heel, leeway, bsp and heading cal etc.
     

    :::Campbell Field::::::www.fieldyachting.com:::
     

     

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