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:

PIC Coastal Classic Yacht Race 2026

Kia Ora, SOLers! Welcome back to Auckland for the 2026 PIC Coastal Classic! In partnership with the New Zealand Multihull Yacht Club, Sailonline is thrilled to bring you this iconic 118nm legendary sprint to Russell.

Expect the unexpected on this tricky course up the North Island's East Coast—from adrenaline-fueled spinnaker rides to nail-biting pre-dawn lulls. This year, we take on the elements in the highly popular Seacart 30. Designed by Marc Lombard, this nimble trimaran features a challenging polar that rewards pure tactical precision.

Chart your course, conquer the coastal currents, and race for ultimate bragging rights! Upon crossing the finish line in scenic Russell, the traditional reward of bacon butties and rum awaits!
Race #2067
INFO by brainaid.de
Seacart 30 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC - SUPBUD - RED
Race starts: Oct 23rd 22:30 Registration Open!
▶ Flash
GO TO RACE

Mad Max by Balloon 2026 - Across the Outback


Mad Max Rockatansky doesn’t get to go in a balloon in any of the Legends of the Wasteland, and the Wasteland is not necessarily the Outback of Australia, but Mel Gibson and film director George Miller indubitably are… of Australia, and ballooning as reconnaissance is a main feature of the Mad Max spin-off video game, so here goes: 1500nm in a balloon from somewhere on the edge of the Outback, Goondiwindi, to cross a finish line at Fitzroy Crossing, somewhere on the edge of the Outback!
Race #1974
INFOby brainaid.de
SOL Balloon PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: BOL - SYC
Race starts: Oct 14th 13:00 Registration Closed
▶ Flash
GO TO RACE

Valdes Peninsula TIMED Race 2026

October finds us on the Argentina coast for the Valdes Peninsula race. A UNESCO World Heritage Site the peninsula is a breeding ground for southern right whales. Sail the luxurious blue water Delphia 47 around a 160 nm course in an attempt to turn in the fastest time.
This is 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 #2066
INFOby brainaid.de
PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
TRQ4 - TRCH - SYC
RACE CLOSE: Saturday,
24 October at 23:00 UTC
Race starts: Oct 11th 12:00 Registration Open!
▶ Flash
GO TO RACE

Arctic Tern - Greenland to Antarctica 2025

Welcome to the fifth leg of our MIG series. Now it's time to race the Arctic Terns, on their migration from Greenland to Antarctica, 8300 NM. This is also part of our monthly Ocean Championship, and as such the first race of OCQ4 2026. This race will be sailed in our Maxi Trimaran. Race #2061
INFO by brainaid.de
Maxi Trimaran PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230 Ranking:
OCQ4 - OCCH - SYC - MIG
Race starts: Oct 05th 11:00 Registration Closed
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member KaSToR
  2. Sailonline Yacht Club Member CriticalHippo
  3. Sailonline Yacht Club Member WRmirekd
  4. Sailonline Yacht Club Member rafa
  5. Sailonline Yacht Club Member rumskib
  6. Sailonline Yacht Club Member Panpyc
  7. Sailonline Yacht Club Member cdhinman
  8. Sailonline Yacht Club Member BRENTGRAY
  9. Sailonline Yacht Club Member rthinman
  10. Sailonline Yacht Club Member ita10267

View full list

Series

Mobile Client

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

The mobile client