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 » Technical Support » Crossing the Finish Line

Posted by
Mouthansar


Users avatar

Posts
123
Registered at
2009-12-25 22:49:08
2017-11-04 17:43:38 - Crossing the Finish Line
Question: Is there a server-side algorithm that recalculates finishing time in case a boat is not at 100% perfection?

Background: I rode shotgun with Wolff in the latest 40' Class race. At a critical and inopportune moment, just before the finish, he received an emergency call from his work.
I made the last 2 - 3 course changes.

Wolff finished 3rd as witnessed by the top bar and right column. Within moments he was 7th! Then, after another few moments 6th, which he was very happy with; but I am still astounded by the result changes.
Posted by
kroppyer


Users avatar

Posts
347
Registered at
2010-02-05 15:25:55
2017-11-04 23:02:21 - Re: Crossing the Finish Line
Rankings of an individual race are calculated every minute or so. The DTF is updated more often. So it may be the case that the ranking updates and places boat A on #1 and B on #2, just before they finish. Then B overtakes A and they finish. The leaderboard will update DTF, showing #1: A, #2: B, both with DTF 0 (finished), and after a minute, maybe little more, they switch position to reflect that actual finish order.

I'm not sure how to explain two changes after DTF has reaches 0, but the main idea is that the actual ordering/ranking of the leaderboard is lagging behind a little bit, which usually isn't a big deal, but when people are finishing close together, the leader board need a couple of minutes to settle.
Posted by
outlaw


Users avatar

Posts
33
Registered at
2012-06-01 13:37:55
2017-11-05 11:27:33 - Re: Crossing the Finish Line
The short and correct answer is that only leaderboards on the frontpage matter...

Ranking order is updated like every 5 minutes (?).
DTF leaderboard and fleet positions every minute.
Actual boat positions, as in observing your own boat, every 10s (nominal, may be closer to 11-12s, and somewhat random), or every 30s (precise, 30.00s) for 'inactives'.

The key is that updates are sequential, no two boats have the same update time.

Now imagine three boats that are very even, then their ranking is determined by who has the most time elapsed.

Leaderboard shows
A xx:01:09
B xx:01:07
C xx:01:01

Now update intervals are not precise, we get a roll-over

B xx:05:09
C xx:05:03
A xx:05:01

B has not sent a command for 18 min and is switched to 'inactive'

C xx:10:07
A xx:10:05
B xx:09:40

Next step we cross the line...

C xx:10:07+2s
A xx:10:05+4s
B xx:09:40+29s

Nobody gains anything.

Please login to post a reply.

Races

Next Race: 00d 00h 00m

Current Races:

Carib Rum Run 2026


Ahoy, ye landlubbers and seasoned salts! Welcome back to Sailonline’s legendary Carib Rum Run, perfectly timed to kick off on International Talk Like a Pirate Day, 19 September!

This year, we command the magnificent Falkun—the ultimate high-tech superyacht modeled after the iconic Maltese Falcon. This 1759nm slalom takes us through the Caribbean’s rum islands to plunder barrels from local distilleries and deliver them to the rum-parched sands of Cancun.

Join SYC before the finish to disguise yer boat with a pirate name for this race only. Hoist the sails, sharpen yer cutlasses, and plot your winning course!
Race #2060
INFO by brainaid.de
Falkun PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC
Race starts: Sep 19th 05:00 Registration Closed
▶ Flash
GO TO RACE

Shearwater - Rio de la Plata to Irish Sea 2026

Welcome to the fourth leg of our MIG series. This time we're racing the Sooty Shearwater on their migration from the breeding grounds in South America to the northern Atlantic. This is also part of our Ocean Championship, and as such the third race of OCQ3 2026. This race will be sailed in our Gunboat 90. Race #2055
INFO by brainaid.de
GunBoat 90 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
OCQ3 - OCCH - SYC - MIG
RACE CLOSE: Thursday,
October 1 at 2300 UTC.
Race starts: Sep 02nd 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 cdhinman
  6. Sailonline Yacht Club Member Panpyc
  7. Sailonline Yacht Club Member rumskib
  8. Sailonline Yacht Club Member rthinman
  9. Sailonline Yacht Club Member BRENTGRAY
  10. Sailonline Yacht Club Member Sax747

View full list

Series

Mobile Client

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

The mobile client