Post by iconPost by Lasse | 2018-01-11 | 16:24:29

In the Clipper race sezo wanted me to do some tacks (red arrows) which I couldn't see the meaning with. Instead I used a fixed TWA of 45 degrees because I would then reach the point with the blue arrow 10-20 minutes faster. Is it a bug or limitation in the routing algorithm? Or have I misinterpreted the green dotted line?

/Lasse



commenticon 8 Comments
Post by iconPost by toxcct | 2018-01-11 | 16:31:59
Pro Winches option checked maybe ?
Post by iconPost by Lasse | 2018-01-11 | 16:51:10
Yes. Which is also the only option my boat has.

The green dots and circles on the green line lies further away than the isochrones. How is that possible?? I thought that the isochrones represents every reachable point (at whole hours i.e. 12.00, 13.00) with perfect routing. But the green line with fixed TWA can easily take you further in the pic above. I don't understand...
Post by iconPost by zezo | 2018-01-11 | 16:51:36
It does that kind of stupid things sometimes, but it's hard to tell exactly why after the fact.
Post by iconPost by zezo | 2018-01-11 | 17:10:50
One possibility is that the short segments on port tack at your red arrows are "too backwards" to the destination, so fall outside of the router scope. Looks unlikely in this particular case, but hard to tell without the numbers over few of the black dots.
Post by iconPost by Lasse | 2018-01-11 | 17:27:03
Is this what you need?



Post by iconPost by zezo | 2018-01-11 | 17:59:30
Yes
Post by iconPost by zezo | 2018-01-12 | 00:23:09
Hmm. Saw something simililar myself right now. It looks like the router skips sailing at TWA 50 for certain winds speeds in the Clipper. Will have to take a better look.
Post by iconPost by zezo | 2018-01-12 | 07:56:24
I found the culprit. Off-by one error that would skip sailing at the TWA next to the optimum in certain conditions, like skipping TWA 50 with VMG at 45 above.

Actually the list of possible angles read 35,45,50 ... and they are indexed, so the 4th was 55 instead of 50.

That explains why the isochrones fall back behind the green line between 45 and 55.

The problem was present in all races, but most visible in the Clipper because of the sharp peak in the polars at TWA 50.

Thanks again for the note.

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Navigating to "xxx.0" TWA
26
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Tara4 - no refresh
2
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Jules Verne: Inconsistency of headings and speeds, simulation !!
5
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VR, Zezo, Qtvlm card offsets
2
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Island's coordinates
34
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Tara Ocean 4
6
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Solo Maitre Coq
21
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Adjustable timeshift ?
3
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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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