Post by iconPost by tlew | 2014-11-22 | 14:15:53

Previously it has always been accurate what boat speed zezo.org and VORG displays.
But the last hours I have noticed that the speed in VORG is lower compared to what zezo.org claims it should be. I have checked that the heading, sails, and position of the boat is the same. Also the wind and wind direction is the same between them two, but still, in VORG I get a lower boat speed compared to what zezo claims.

commenticon 5 Comments
Post by iconPost by tlew | 2014-11-22 | 15:29:52
Anyone that have an explation why it may differ?
As for now, Zezo recommends a heading of 56 degrees. Boatspeed would be 22 knots.
However, when I set the heading to 56 in Vorg the boatspeed is 21,1 knots. Sail, wind direction, wind speed, all are the same between them two, so how come this quite big difference? Don't think I have seen it before?
Post by iconPost by zezo | 2014-11-22 | 15:46:14
You have probably noticed the fact that sometimes (quite often, in fact) heading, twa and wind direction don't add exactly to 0/360

In your case the data is something like heading 55, wind 272 and twa 141

Heading 55 actually means twa 143, and because of the slope of the polars the corresponding speed drops about half knot in just 2 degrees.

The reason why heading and TWA don't match exactly is the wind interpolation. The heading is actually averaged direction to a point a bit further down the track.

I personally use the track tool to check if the green or the red line approximates the track better, and always check the polars to see if there is a crossover or optimum point nearby.

To recap: The indicated speed should match the indicated TWA, but the indicated heading may be off, and speed at indicated heading will differ. When sailing up/downwind you should generally consider the TWA, but there are cases when the router wants to get somewhere in straight line and then the heading is what matters.
Post by iconPost by tlew | 2014-11-22 | 16:24:12
Yes, the speed matches the TWA. Thanks for the explanation.

The following made me curious: "Check the polars to see if there is a crossover or optimum point". Not sure exactly what it means. Can you elaborate some regarding that?
Post by iconPost by zezo | 2014-11-22 | 16:31:51
Crossover points are where sail changes occur. At some wind speeds there are quite big dips between the sails. Take 24 knots as example - it would be faster to sail at TWA 100 and then 110 if you want to go in the direction of TWA 105 in straight line.

And then even single sails can have dips in the polars - like the jibs in the vvorg have a dips around 55, which might make sailing at 50 and then 60 faster than the straight line.
Post by iconPost by tlew | 2014-11-22 | 20:54:38
Thanks!
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Game appears stuck on 00Z weather from yesterday
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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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Colone Tile red
3
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Destination setting - Fixer la destination
2
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Anyone else experiencing erratic course changing behavior?
9
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Looks like game winds not updating.
6
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difference between wind on he map and wind on the route
8
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Cape Horn route is not possible it is crossing land
6
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Lost the lines..
2
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all.grb question
3
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2 routings ?
1
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What point or line is being used to determine the rankings?
61
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180 degree bug and downwind track
11
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démarrer avec zezo au milieu de la course
2
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Local times in the charts
1
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red and green lines ahead of isochrones
13
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20 Minute tack
6
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nemo point challenge problem
8
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Nemo Point Challenge
51
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Point Nemoers
1
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Route doesn't give prediction over 24h anymore
7
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Iterations on server & Zezo
5
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Sidney-Hobart 2020
3
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To day zezo don’t give me any route
6
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Fatal Grib error tonight ?
2
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predicted times JV
3
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Loick Peyron uses zezo, the best virtual sailing router ;)
9
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Orthodromy vs loxodromy around the poles
6
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Strange 1st dot heading
3
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Campbell Island
4
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VR bugs and rants
11
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Cap constant, ou angle au vent ? Constant heading, or wind angle?
18
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Colors of wind in the chart
4
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