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  •  » Tidetech time is early by 1 hour in Expedition

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    10/07/2024 7:11 am  #1

    Roma
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    Registered: 8/02/2024
    Posts: 7

    Tidetech time is early by 1 hour in Expedition

    I used Expedition with Tidetech a few times for Narrangasett, RI, USA and I noticed a strange thing:
    1. time of current predictions displayed in Expedition are 1 hour earlier then same predictions displayed on Tidetech website. I checked that with slack time for the tidal current. 
    2. I compared the time of slack with tidal predictions from CMap and CMap is 1 hour later then Tidetech in Expedition.
    3. Observations confirmed that the slack was 1 hour later than displayed by Tidetech in Expedition (thus confirming the time in CMap and Tidetech website was correct)
    3. The PC with Expedition works in UTC-4 with daylight saving enabled mode.

    I'm curious if anybody had a similar experience? is it something wrong with my settings or possibly a bug in software? if so, which one - Expedition or Tidetech API?

     

    10/07/2024 11:24 am  #2

    Nick
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    Registered: 9/16/2015
    Posts: 3,320

    Re: Tidetech time is early by 1 hour in Expedition

    Exp just uses the times in the Tidetech grib file, so, if there is an error, it will be in the model or grib file creation.

    I think this has been seen before with Tidetech data.

    The C-Map arrows are probably the same as the NOAA tidal currents in Exp.

    Have you seen The Current Lab? Link on the Exp weather web page.

     

    10/08/2024 3:02 am  #3

    Roma
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    Registered: 8/02/2024
    Posts: 7

    Re: Tidetech time is early by 1 hour in Expedition

    Thank you, Nick. I will check out the Current Lab. Is there a way to download their grib files in an easy way as with Tidetech and other weather data?

       •Thread Starter
     

    10/08/2024 10:46 am  #4

    Nick
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    Registered: 9/16/2015
    Posts: 3,320

    Re: Tidetech time is early by 1 hour in Expedition

    You have to get it from their web site, but it is probably the go-to model for for your site.

    I don't know why OFS doesn't have models for LIS and Rhode Island.

     

     

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