Post by iconPost by BooBill | 2019-11-24 | 15:34:11

It's pretty clear to me that VR includes a drift to leeward. If you set a heading to pass just to windward of an obstruction, over time your predicted path will drift down to hit the obstruction. That's a neat little complication that replicates one of the real challenges of sailing. There's a bunch more I'd love to see. Maybe that should be another thread though.

So, my question is, does the router take this into account? How is it quantified?

commenticon 4 Comments
Post by iconPost by zezo | 2019-11-24 | 15:56:26
That's not drift. It's a random rounding error and difference between client and server weather data.

It's been discussed a lot of times here, but in short there can be considerable differences between client (which displays your boat) and server (which actually moves your boat), especially during the wind update time. Can easily be observer in the Chrome extension data. Most difference in unstable weather like a ridge/center of a high.

Post by iconPost by BooBill | 2019-11-24 | 17:25:33
Ahhhhhh!

So, going through a transition zone you pretty much have to take over and hand steer. I've always seen that as a competitive opportunity when you tack/gybe at the moment of the wind shift, rather than on the router's discrete time steps

Is what you are saying, that what you see reported on the screen, is not actually exactly what's happening in the server, necessarily?
Post by iconPost by zezo | 2019-11-24 | 17:40:49
Yes. In a transition zone you can see a zig-zag route as a result of the client moving the boat one way and the server correcting the position every 5 minutes. It's safer using fixed TWA, otherwise you may end up with a bad angle.

Around the coast you better use waypoints. I did not follow my advice today and hit La Palma.

Post by iconPost by BooBill | 2019-11-24 | 19:44:29
LOL. I very nearly hit La Palma, but fortunately, I woke up at 5am and thought to check my programation wasn't drifting into the island.
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Adjustable timeshift ?
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gate crossing question
7
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Expanded View on PC
3
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Panic at VR Nord
7
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Delays during the sail changes, or directions changes
3
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(Game wind = Zezo wind ) ⍯ (Grib winds = Windy.com)
7
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VR ending the ELO ranking.
34
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NMEA feed
128
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Dashboard Map Track Label not including the segment.tag
5
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VR ingame time
6
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VIRTUAL REGATTA and Phillip Ganier. Worst and worst every day...
7
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beta.realsail.net
2
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Escort Frigate
6
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Out of memory. If you are the developer of this content ....
17
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Question about GFS Grib
5
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RORC Caribbean 600
14
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sliding VSR
16
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Trying to use Zezo to select best combination of sails to select
7
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TARA OCEAN 3
9
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RORC Transatlantique Race
6
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Game appears stuck on 00Z weather from yesterday
4
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Sydney to Auckland
28
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Personal Message pages deleted
7
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New zezo fonction
2
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VR Ranking 2021
7
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Autosail malfunction
3
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Comments from a newbie to "long term" routing
1
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Massive thanks to Cvetan
7
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Fleet section mode record not working
2
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Possible routes on the Map tab
3
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Purple skippers on VR Dashboard
3
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UTC or CET time ?
2
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multiple routes?
2
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Real Sail
4
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Map a little gloomy
8
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Trophée Jules Verne - Route à l'envers ?
2
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Looks like weather updates offline for next 18h
26
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Bring the good old days back
7
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All.grib 0.0k ?
9
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different speed
3
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Strange 0.5 mille VR Scale
3
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Just an idea for a new feature...
7
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Connexion impossible
1
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Donations
7
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New leader - seems to be using Zezo
38
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Bravo Zezo
4
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zezo : Huge job - Huge thx
2
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Difference between boat speed display on VR, dashboard and polar curves
7
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Vendée Globe: Track lines falling too short of ischrones
8
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Tara Ocean
29
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VR winds currently not up to date ?
1
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"Sails Change" within the Programming
3
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RORC Transat finish moved to Antigua
3
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Weather update not appearing...
19
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Dashboard not updating.
6
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Boats Skins Vendée Globe
3
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Safari on iOS: Bearing lines gone
3
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Wrong coordinates in zezo
2
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Winds in the chart do not show changes between 78 hours and 114 hours forecast
2
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Decoding of All grib
6
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I CANNOT ENTER FOR 3 HOURS IN THE GAME
23
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Why the vc data is yellow underlined ?
3
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Jules Verne 2020 - "Start NOW" discrepancy VS real time
7
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Would like to know the reasenable time to update your pisition on zezo
16
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Arrival Vendée Globe in Normandy !!?
4
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MIssing the Obvious: How to get Zezo routes back into VR
2
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VG 2020-01-02 has Zezo a problem with geographic or ...
8
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How to retrieve a waypoint (TWA/HDG) that already passed...
16
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Track duration window
3
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Ways to bypass the client to give orders?
6
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Problem to Load zero route in windy.com
40
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French tutorial for zezo
4
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boat positioning
2
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Export routes in GPX format ?
4
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Sail selection issue ?
11
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Your friends boats in Google Earth
2
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Delay in Wind update ?N
1
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VR Dashboard
54
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