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    4/19/2019 7:55 am  #1

    US30306
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    Registered: 2/27/2019
    Posts: 4

    Route Optimize w/o Wind

    Just learning Expedition and was trying to look at a delivery route without wind influence. Attempting to understand current affects on route with different departure times but keep getting a No Wind at Start error. Is there a way to defeat this or fake it out at least?

     

     

    4/19/2019 10:03 am  #2

    Ernie M
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    Registered: 11/05/2015
    Posts: 422

    Re: Route Optimize w/o Wind

    US,
    You will have to have wind on the area BUT
    go in to Settings/Opt Advanced Set 'Motoring Speed' to your assumed sailing speed
    Then set 'Minimum Sailing Speed' to something higher than your highest Polar speed
    I think that will accomplish what you want.

    Ernie

     

    4/19/2019 10:29 am  #3

    Ernie M
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    Registered: 11/05/2015
    Posts: 422

    Re: Route Optimize w/o Wind

    More:
    It gets kind of quirky if the grib wind wants to produce a polar speed greater than your assumed speed

    You can overcome that by creating a dummy polarchart with real slow Bsp, say 4 kts for ALL winds
    That way you'll always get a motoring result (your assumed speed) and you'll get a varied result doing a Multiple Optimization based on current (drift)
    PM me if you want the polar for SloboatXX

     

    4/21/2019 3:46 am  #4

    US30306
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    Registered: 2/27/2019
    Posts: 4

    Re: Route Optimize w/o Wind

    Thanks for the suggestion, it worked with some caveats. Still need to use a Grib file that is time stamped so that drives the Expedition loaded tides. Went through the tide charts and found a similar time frame that I have a Grib for. Maybe not perfect, but enough to see current influences on the deliveries.

       •Thread Starter
     

    4/21/2019 5:28 pm  #5

    Nick
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    Registered: 9/16/2015
    Posts: 3,285

    Re: Route Optimize w/o Wind

    There is also the User Wind option on the Optimal routing ribbon panel.

     

    4/22/2019 3:52 am  #6

    Ernie M
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    Registered: 11/05/2015
    Posts: 422

    Re: Route Optimize w/o Wind

    Nick,
    It would be handy if there were a "user wind" tick box in the Optimal/Multimal window, for this kind of planning.
    Ernie

     

    4/22/2019 11:31 am  #7

    Nick
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    Registered: 9/16/2015
    Posts: 3,285

    Re: Route Optimize w/o Wind

    The user wind option does that.

     

     

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