Facebook

Login

Support Sailonline

If you haven't already - join the SAILONLINE YACHT CLUB!

Please also consider making a donation - all amounts are greatly appreciated!

Board » General Discussion » Velocity made to course

Page: 1 2 3 Next

Posted by
Adam


Users avatar

Posts
5
Registered at
2009-01-11 16:55:10
2009-01-22 05:23:40 - Velocity made to course
Is it possible to add this indicator ? Plus miles lost or gained in lets say last 3 hours to the leader ? And mark on the polars the optimum upwind/ downwind angles to VMG ?
Posted by
jakob


Users avatar

Posts
364
Registered at
2007-09-04 10:05:30
2009-01-22 07:59:59 - Re: Velocity made to course
Thanks for the suggestion. I will put it on the list but I cannot promise anything soon.
...one of the guys behind the game...
Posted by
Jeroen


Users avatar

Posts
245
Registered at
2007-08-15 09:17:47
2009-01-23 14:02:03 - Re: Velocity made to course
We are working on some additional race information.

In the mean time you can find a lot of race info here: http://stenum.se/sailonline/
I am a ex-admin of SOL who joins in from time to time.
Posted by
Impromptu38


Users avatar

Posts
8
Registered at
2009-01-04 22:30:14
2009-01-23 19:40:08 - Re: Velocity made to course
Joeron:

The experimental information is just fantastic: Great Work

I will overload my thinking, but I like haveing that information at hand.

Thanks, Ron Casciato, Impromptu38
Posted by
AGage


Users avatar

Posts
411
Registered at
2008-12-27 10:31:57
2009-01-25 16:26:56 - Re: Velocity made to course
a6km said @ 2009-01-22 05:23:40:
Is it possible to ..... And mark on the polars the optimum upwind/ downwind angles to VMG ?
================================
If VMG is indeed relevant, you can find the optimum angle quite easily using the steering tool, as it shows you the boat speed and vmg values for various angles as you slowly move the pink 'steering line' to different headings on the map. Note near the bottom right corner of the polar diagram this information is provided. (Hint: look around 42 upwind, and 142 downwind, approx)
Also, it seems to vary very slightly in differing wind strengths, ie from 10 knts to 25.
You can also calculate vmg quite easily with any calculator, incuding the standard Windows one, using the formula: boatspeed * cos(D - twa), where D is 0 for upwind and 180 for downwind, and always use the positive twa (ie if it is actually -140, use 140, although this is really only necessary for downwind calculations.
More specifically twa should be replaced by angle to the rhumbline, but often twa is fine.
Hope this helps...

But one question to the developers of this great software (I am a programmer also).... As the vmg is only displayed to a single decimal point (in the game screen not the polar diagrams), is there any reason to sail at an angle that gives a vmg of, say, 7.43 than 7.47? or is it always rounded (up & down)?
I help develop the client interface for the best online ocean racing sim there is... __/)/)_/)__
Posted by
jakob


Users avatar

Posts
364
Registered at
2007-09-04 10:05:30
2009-01-25 21:04:02 - Re: Velocity made to course
Thanks for the feedback!! vmg is rounded only in the user interface. Internally we never round anything. Ohh yea, I think kalle rounds the numbers sent in the commands fom client to server. Hence, twa and cc is not sent to server with more than 2 decimals I think.

/Jakob (one of the developers)
...one of the guys behind the game...
Posted by
Adam


Users avatar

Posts
5
Registered at
2009-01-11 16:55:10
2009-01-26 12:53:30 - Re: Velocity made to course
AGage

I know that I'm just saying not everybody understands here what is really going on so an indicator of VMC not VMG is often better because it tells you how fast is the boat traveling to the next waypoint or finish or scoring gate. We know that the straight line is often not the fastest one ... and a lot of people get confused with the VMG as when they reaching the VMG is really small but they sailing so fast so why is it small ? I think it would be nice to have this indicator one day. Cheers.
Posted by
Zembu


Users avatar

Posts
41
Registered at
2008-12-15 20:58:27
2009-01-26 14:41:49 - Re: Velocity made to course
Re having VMC, firstly if it were possible, surely this would make it too easy and secondly it would impose a huge burden on the servers as everyone's waypoints (to which their respective VMC's related) would be different.
Posted by
jakob


Users avatar

Posts
364
Registered at
2007-09-04 10:05:30
2009-01-26 16:20:00 - Re: Velocity made to course
Hmmm, I think that VMC would confuse sailors too. Imagine the case here you are far from the rounding mark which is almost 90 degrees to your right and you are heading exactly straight to the goal. Your vmc would read almost 0.0 while sailing 25 knots! That will be confusing. Or..
...one of the guys behind the game...
Posted by
erratic


Users avatar

Posts
5
Registered at
2008-10-15 19:35:40
2009-01-27 06:25:00 - Re: Velocity made to course
^
There shouldn't be any additional load on the servers - the client could calculate it.

Page: 1 2 3 Next

Please login to post a reply.

Races

Next Race: 00d 00h 00m

Current Races:

TuziTekwini TIMED Race 2026

Sailonline is delighted to have been invited again to partner with the King Shaka Yacht Club (KSYC) of South Africa to bring a virtual version of the Tuzi Tekwini Ocean Raceto our online community.
The Tuzi Tekwini Ocean Race is a near 90 nautical mile race down the east coast of South Africa from the port of Richards Bay to the port of Durban. Achievable in a single day and seen by some as an easy mile-builder, the course is more tactical than some think and should not be underestimated. This iconic race promises to be an unforgettable experience for yachting enthusiasts.
Our online version of the race will be a TIMEDrace so you may RE-REGISTER HEREto try again after finishing a run. You will have two weeks to test your skill and decision making after the race opens.
Race #2037
INFOby brainaid.de
Sailonline’s virtual yacht for all your runs will be our much-loved Farr 38 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
TRQ2 - TRCH - SUPBUD - SYC
RACE CLOSE: Saturday,
13 June at 23:00 UTC
Race starts: May 31st 12:00 Registration Open!
▶ Flash
GO TO RACE

Susan Hood Trophy Race 2026

Lake Ontario Offshore Racing (LOOR) welcomes racers to Sailonline’s virtual version of their annual Susan Hood Trophy Race. This year, this pleasant weekender on western Lake Ontario will be of about 60nm in length, and online for convenience will start and finish at the Port Credit Yacht Club (PCYC). At or before the real-life Skipper’s Briefing a decision will be made to race the course clockwise (course Delta) or anti-clockwise (Echo). If there is time we will match this online. As before, the race is the first of two that will count towards a special Sailonline's LOOR Series medals, but this year we sail in Jeanneau Sun Fast 3300s. Bon voyage!
Race #2033
INFOby brainaid.de
Sun Fast 3300 PARTICULARS
NAM_AWIP WX Updates:
0245 / 0845 / 1445 / 2045
Ranking: LOOR - SUPBUD - SYC
RACE CLOSE: Friday,
June 5 at 2300 UTC.
Race starts: May 29th 23:45 Registration Open!

▶ Flash
GO TO RACE

SoCal 300 2026


With California Offshore Race Week already well under way, here now is your chance to participate virtually in SDYC's challenging 243nm (as the seagull flies) SoCal 300 from Santa Barbara to San Diego. With as ever a wide and wild range of boats entered for the real race, whose progress we hope we will be able to follow on our own chart by linking to the YB tracker, virtual SOLers will have to dig deep to remain competitive in our trusty Santa Cruz 52s.
Race #2036
INFO by brainaid.de
Santa Cruz 52 PARTICULARS
NAM_AWIP WX Updates:
0245 / 0845 / 1445 / 2045
Ranking: SUPBUD - SYC
RACE CLOSE: Wednesday,
June 3 at 2300 UTC.
Race starts: May 28th 20:00 Registration Open!
▶ Flash
GO TO RACE

Cross the Convergence 2026 - St Helena to Cape Verde


The fourth race of our series of ocean voyages across the World’s convergence zones takes us out of the Pacific into the Atlantic for a 2200nm race in Judel Vrolijk 62’s, from the desolation of St Helena, there where Napolean Bonaparte saw out the end of his life, to the even greater desolation of Fogo in the Cape Verde’s. You’ll have to cross the equator, with the coasts of Africa and South America your only navigational restrictions.
Race #1984
INFOby brainaid.de
Judel Vrolijk 62PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: CCZ - SYC
RACE CLOSE: Saturday,
June 6 at 2300 UTC.
Race starts: May 22nd 18:00 Registration Closed
▶ Flash
GO TO RACE

Tasmania to Kamchatka 2026

Welcome to yet another all-new route. Tasmania to Kamchatka, part of our Ocean Championship and also the third leg of the ROW (Round the Old World) series. Be aware of the obstacles on the way, likely to split the fleet. It's like X:mas to X:mas, crossing the same waters, navigating the same archipelagos. This second race of OCQ2 2026 will be sailed in our revised 'version 2' Imoca 60 Foil. Race #2031
INFO by brainaid.de
Imoca 60 Foil v2 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: OCQ2 - ROW - OCCH - SYC
RACE CLOSE: Tuesday,
June 2 at 2300 UTC.
Race starts: May 04th 11:00 Registration Closed
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member WRmirekd
  2. Sailonline Yacht Club Member KaSToR
  3. Sailonline Yacht Club Member CriticalHippo
  4. Sailonline Yacht Club Member rafa
  5. Sailonline Yacht Club Member Panpyc
  6. Sailonline Yacht Club Member bonknhoot
  7. Sailonline Yacht Club Member HoratioPugwash
  8. Sailonline Yacht Club Member rumskib
  9. Sailonline Yacht Club Member CollegeFund
  10. Sailonline Yacht Club Member sassy63

View full list

Series

Mobile Client

SYC members have the benefit of access to our mobile/lightweight web client!

The mobile client