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Board » Technical Support » Crossing the Finish Line

Posted by
Mouthansar


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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


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347
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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


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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.

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