Post by iconPost by Stormbringer | 2018-01-02 | 19:45:39

This may be remedial, but the islands in the Bass Straight and the landmass profile of southern Australia don't seems to align between the VR interface and the chart here. I can't maintain the course prescribed here without hitting land as we gybe up the coast.

Last night my plotted course here had me gybing before reaching the Kent Islands, but that same TWA and time in VR put me well beyond them.

I'm sure it has something to do with different map projections or something, just wondering. Thnks Zezo amazing site here.


commenticon 5 Comments
Post by iconPost by zezo | 2018-01-02 | 20:55:42
Map projection does not matter. Under the hood it's all floating point numbers for latitude and longitude.

What matters is the resolution of the chart (important for small islands) and all the small differences in wind speed and directions. Half degree here, 0.1 knots there and things add up.

Even the game interface itself should be taken with a grain of salt - server uses slightly different winds and few hours sailing on fixed TWA can get you in unexpected position.

See this thread if you haven't already http://zezo.org/forum.pl?tid=6195
Post by iconPost by Stormbringer | 2018-01-03 | 15:40:31
I understand the map resolution, but what would you recommend if my Zezo plotted track ends up routing me through an island in VR? If I tack/gybe early I'm off the ideal course.
Post by iconPost by zezo | 2018-01-03 | 17:22:00
It's hard to give general answer. You should stay within optimum TWA limits most of the time (maybe push a bit above sometimes, 145 instead of 141 at moderate speeds (VOR boat) is small loss and worth staying for hour or two instead of two gybes.

If it's not on the VMG point then go for the shorter distance. Or the stronger wind side. Or the side with better angle after passing the island.
Post by iconPost by Stormbringer | 2018-01-03 | 17:54:12
OK, still don't understand the reason for the discrepancy between Zezo and VR maps, but you're doing enough work already, we can't expect you to steer the boat for us as well!
Post by iconPost by zezo | 2018-01-03 | 18:12:00
The router has very coarse map - about half mile resolution, so the data is small (few megabytes) and the lookup is fast.

Every push of the Go button involves few million trigonometric calculations, polar lookups, collision lookups, gate checks and it's hard to squeeze in 2-4 seconds run time.
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3
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Nord Stream *3*
11
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Game on 12Z, but Zezo still working with 06Z
3
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race wait points
1
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special boats?
7
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VR Dashboard in Firefox?
6
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ESCARGOT CLASS
11
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Los Angeles - Honolulu
26
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Rounding a Buoy
12
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VR Waypoint Heavy Bug Reporting
3
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Time of ending Jules Verne
4
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Shore detection by Zezo
2
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Nord Stream Race 2
7
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Trying to Break the VR Map Mistery !
3
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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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