Post by iconPost by PatH | 2012-01-15 | 01:38:04

Hi Cvetan,

I noticed today that often when I choose a larger timestep (5 day or 7 day plan) when tracing roughly the same path, that the larger timestep seems to indicate it will be more efficient (go farther by a set period of time). I would think that the smaller the timestep the more efficient a course the algorithm could find. Are my eyes just going blurry from looking at the screen too much?

Cheers,

commenticon 6 Comments
Post by iconPost by zezo | 2012-01-15 | 09:12:50
There is more error in the longer paths. When you do a 7-day run the step i 1 hour. It will overestimate the boat speed if you are headed into weaker winds, because it will sail for 1 hour at the higher speed instead of decreasing it gradually.

That will also change the path a bit.

The other problem is that you can't really fit integer numbers of 1-hour steps in 3.5 hours, so your starting time is rounded to the nearest hour (it uses old wind data for up to a hour after the changes).
Post by iconPost by PatH | 2012-01-15 | 14:37:08
OK thanks Cvetan. I should have figured that out. In summary, the smaller timesteps really are more accurate (as expected). The apparent "enhanced efficiency" of the routes found by the larger timesteps is a combination of numerical and model error. Thanks!
Post by iconPost by zezo | 2012-01-15 | 14:48:26
Yes. You just have to use 2-pass approach - check the general strategy with on the 5-7 day forecast, then set the destination 15-20 hours ahead along the track and request 1-day routing to get very accurate track (same 10-minute steps as the game).

A variable step algorithm could do it in only one pass, but I don't think that the overall result will be too different. The error in the weather model 2-3 days ahead is bigger than the routing error almost all the time.
Post by iconPost by PatH | 2012-01-15 | 17:48:19
Thanks. Pretty much exactly what I've been doing (at least in quarters). In the open ocean I'm not sure I have time to manage 10 minute route adjustments.
Post by iconPost by PatH | 2012-01-15 | 17:52:48
*close-quarters
Post by iconPost by zezo | 2012-01-15 | 18:25:25
Sometimes the more precise track is more stable and straighter than the coarse one, so I usually check it if the 7-day track makes small random turns.
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VR Team ranking race criteria
1
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No news from Virtual Regatta about VOR (the ocean race).
1
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Log-in VR game marathon..
5
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VR Dashboard
5
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Dashboard - Precdicted Time ATLANTIC RECORD
1
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the prawn star
9
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polars virtual regatta
8
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how to convert Grib files to Grib2?
3
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VSR, XP points
7
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Predicted times
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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