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:

Red Eye - Melville Island PYOC 2026

Melville Island is the largest of the Tivi group opposite the port of Darwin in the Timor Sea. Tropically forested and thinly populated, not a lot goes on there, but let’s race around it anyway, lar- or starboard round, it’s a little more than 120nm, so, no matter where you are navigating from on the planet, you will be hard-pressed to complete the course aboard your J-80 in daylight hours!
Race #2003
INFOby brainaid.de
J-80 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: RED - SYC
RACE CLOSE: Tuesday,
March 31 at 2300 UTC.
Race starts: Mar 24th 12:00 Registration Open!
▶ Flash
GO TO RACE

Cross the Convergence 2026 - Guam to Ouvéa


The third race of our series of ocean voyages across the World’s convergence zones takes us southeastward now down the Pacific, from Guam’s Apra Harbour at 13.5 degrees North, back across the Equator to the glorious New Caledonian resort island of Ouvéa, on the edge of the Tropic of Capricorn at 20.5 degrees South. It’s 2400nm, and there’s more than a few other islands in the way, so mind where you go in your Ocean 50s. Race #1981
INFOby brainaid.de
Ocean 50PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: CCZ - SYC
Race starts: Mar 20th 18:00 Registration Open!
▶ Flash
GO TO RACE

Lake Victoria TIMED Race 2026

This month’s TIMED race takes us inland to Lake Victoria in the heart of Africa. Starting at Rosebery Channel in Uganda sail the AC72v2 on a 196nm course around Bugala Island on the way to the finish line in Tanzania’s Speke Gulf. This is a TIMEDrace so you may RE-REGISTER HEREto try again after finishing a run. You will have 13 days and 11 hours to test your skill and decision making after the race opens.
Race #2018
INFOby brainaid.de
AC72v2 Particulars
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
TRQ1 - TRCH - SYC
RACE CLOSE: Saturday,
28 March at 23:00 UTC
Race starts: Mar 15th 12:00 Registration Open!
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member KaSToR
  2. Sailonline Yacht Club Member WRmirekd
  3. Sailonline Yacht Club Member rafa
  4. Sailonline Yacht Club Member rumskib
  5. Sailonline Yacht Club Member Sax747
  6. Sailonline Yacht Club Member CriticalHippo
  7. Sailonline Yacht Club Member vida
  8. Sailonline Yacht Club Member CollegeFund
  9. Sailonline Yacht Club Member Panpyc
  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