Expedition Navigation Software 
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- Expert
Offline - Registered: 4/13/2016
- Posts: 139
Set / Drift
I am set to depart Hampton, VA this afternoon. Headed for Tortola, BVI
I will be in the middle of the Gulf Stream 0700 Dec. 2.
I am using RTOFS for current data. Weather pointer shows 3.5ks, 31T
Route has me heading 160T.
Set and drift are 174T, 0.5kts.
I have use tidal streams so it appears to be ignoring the current grib.
I uncheck that box and I get 3.4kts, 135T.
I just wanted to confirm that is expected data. I had assumed (dangerous) that tidal data would be overlayed ontop of Current GRIBs
- Ernie M
- Moderator
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- Registered: 11/05/2015
- Posts: 400
Re: Set / Drift
UP
I'll let Nick respond to the tech side of your question but would suggest you download Mercator files before you leave as the resolution is hourly v 24hrly
I'm guessing you're using RTOFS because of the availability through Saildocs
Hope I've made this suggestion before you're out of internet access!
Good luck
Ernie
- Nick
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- Registered: 9/16/2015
- Posts: 2,772
Re: Set / Drift
Which tidal forecasts are you using?
Often the Mercator is better than RTOFS
- unplugged
- Expert
Offline
- Registered: 4/13/2016
- Posts: 139
Re: Set / Drift
I was using RTFOS.. I just tried Mercator.
If I check "UseTidal Stream" Gulf Stream Data, RTFOS or Mercator appears to be ignored.
If I uncheck it appears to use this data.
I was just asking if that was expected behaviour.
- •
Thread Starter- Nick
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- Registered: 9/16/2015
- Posts: 2,772
Re: Set / Drift
It will attempt to use a loaded tidal model. If it isn't there, it should revert to the grib data.
For the gulf stream etc, jut disable the tidal option.
The Mercator data has a tidal component, which is useful.