routing differences bitSailor / zezo / offline
Post by iconPost by Sunkist | 2023-01-12 | 18:07:32

comparing zezo and bitsailor and a self made preparatory offline router

I found that the choose different ideal routes with similar settings. I can see this happening due to memory conservation (underlying grid size?!) or CPU conservation using polar coordinates in 5° steps and best VMG angles maybe. So if several routes are nearly identical in time, each router will find a different one due to rounding errors. So far so obvious.

What I do not understand is that the wave propagation front (or how you want to call it) varies significantly between zezo and bitsailor (offline version kind of similar to bitsailor). - Even making sure both use the same GFS run. what are the uncertainties in the routing that lead to this difference? is there a way to minimize them?
Is there a way to give a error-number or uncertainty to each location while performing the routing?

Cheers,
Sunke/Sunkist

commenticon 3 Comments
Post by iconPost by Hardtack | 2023-01-12 | 22:47:49
Given the same parameters - start time, start location, polars, boat options, forecast cycle - the wave propagation fronts (which we call isochrones) should really be very similar. Bitsailor uses the same wind interpolation as zezo, except for technical differences that may lead to different rounding errors. And bugs, possibly. Differences should be most noticeable in light wind conditions.

Bitsailor handles obstacles like islands less well than zezo. This can affect the isochrones sometimes. As the routers don't sail straight into the wind, adverse wind patterns can have the same effect.

There are a few other minor differences between zezo and bitsailor but it's hard to say what may cause the diverging results.

Regarding robustness of the route, I don't know of any way to assign error margins or confidence values to individual route points (assuming that's what you mean by locations).
An overall uncertainty of the optimal route could be derived from reverse routing. Neither zezo not bitsailor does that currently.

Post by iconPost by zezo | 2023-01-13 | 11:22:30
There might be difference in the temporal interpolation during the update cycle. I still have not implemented the supposed 3-grib algorithm.
Post by iconPost by Sunkist | 2023-01-16 | 17:03:57
I think the temporal interpolation during the upgrade process is something VR should worry about/improve ... don't need to mention the artifacts of moving pressure systems.

As soon as I find the time in the next week, I'll try to pin down the precise differences that can be observed. unfortunately quite busy right now. But thanks for your inputs.
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new VR penalties
8
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VR Dashboard 3.16
10
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Estimated Record Time on a record race
8
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no updates since yesterday !!
3
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Predicted times color background
3
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polar NY - SF
2
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Can you go around ground based on the ghost boat ?
9
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[Globe 40 (477)] TWA curve differs from navigation dots by about 5°
2
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Global 40 - new Class 40 polars
16
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Globe 40 on credits
4
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olympic race - which route to choose?
52
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Atlantic record bugg zezo Goto Lizard
3
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Figaro 3 Polars Winches
24
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Bit Sailor Router in RealSail
2
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Modification de destination
1
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Silent debugging
14
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How to manage buoys during absence
6
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Vela- route choosen by your mom
6
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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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Show more ...
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