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Board » Flag Officers » Races » Leg 5 Volvo Ocean race

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Posted by
AcmeRacing


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2007-12-24 06:18:02
2012-03-17 06:41:40 - Leg 5 Volvo Ocean race
I can't figure this out! I have 1907 miles to Cape Horn. NZL 2389 has 2101 miles to Cape Horn. The mileage shows that I am behind them by 1200 miles. It still shows that I have 5300 miles to go. Sorry I only have around 4000 miles to go. What is going on here? Please advise. This kind problems have happend before when crossing the dateline. Please check before the race starts in 18 hours.
Posted by
AGage


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2008-12-27 10:31:57
2012-03-17 09:10:26 - Re: Leg 5 Volvo Ocean race
Does your DTG value shown in race message 'racing with ## nm to go.' differ from the one shown in the leaderboard ??

We are looking into this
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Posted by
AcmeRacing


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2012-03-17 09:17:29 - Re: Leg 5 Volvo Ocean race
Aaron, both are the same!
Posted by
AGage


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2012-03-17 11:17:47 - Re: Leg 5 Volvo Ocean race
This highlights some peculiarities in the way SOL computes your DTG.
In the manual there is an image of rounding a mark, with a line extending from the mark (based on the rhumblines into and out-of the mark). The bearing from your boat to the mark along this line (when your rounding is scored) is also shown on the NOR for that mark.

Now, to compute distance to finish line, the server computes the shortest distance between your boat and this line - computing the point on the line which is closest to your boat at the same time - and then also uses this point to calculate how for to the next waypoint after that. A point further away form the mark thus gets a 'double distance penalty'. It then just adds the rhumbline distance of any remaining legs in the race to get your final DTG value.

So, the server is not computing the exact same thing for the 2 boats, because their point on the 'scoring line' is different, depending what the XTE is.

In fact, if I measure this up now - the South Pole is the closest point on the 'scoring line' for many boats - hence the funky rankings (next leg dist is same for all, but current distance to SP can be less for boats that are more to the W)
Bobbert pointed this out as I was writing the above...
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Posted by
76Trombones


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2009-08-03 18:04:56
2012-03-17 14:12:00 - Re: Leg 5 Volvo Ocean race
This is the way SOL roundings always work. They'll start to make a bit more sense as we get close to the cape, but will likely go haywire again after we round. They'll be more and more "correct" as we approach the turn into Itajai, and will be perfect at the finish...



--- Last Edited by 76Trombones at 2012-03-17 14:15:02 ---
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Posted by
AcmeRacing


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2007-12-24 06:18:02
2012-03-17 16:46:49 - Re: Leg 5 Volvo Ocean race
76 Trombones. I will agree with your theory that we are using the south pole for distances. Then, I am presently 200 miles closer to the south pole than the leader and I am still listed as 1400 miles behind them? I am sorry but your theory doesn't add up with the rankings.

--- Last Edited by AcmeRacing at 2012-03-17 16:47:47 ---
Posted by
sol


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2008-08-14 11:08:14
2012-03-17 17:23:01 - Re: Leg 5 Volvo Ocean race
Don't worry about it! You'll pop out the other side soon.

Each boat uses a different point to calculate DTG, based on what is the shortest path to the next rounding (when it says "rounded", *not* the mark).

Mrnil is currently calculating through the Horn, as that is the closest point on the rounding line from his position. Small distances N/S make a huge difference due to the very shallow angle the Cape Horn mark makes in the GC route.

Bottom line is that all the rankings are consistent (consistently "wrong" according to where we will actually sail) and will sort themselves out by the end.
Posted by
76Trombones


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2012-03-17 17:43:39 - Re: Leg 5 Volvo Ocean race
That was me... And you'll notice that you've made the transistion to #1! I admit that it's not intuitive.
Posted by
AGage


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2012-03-23 14:28:34 - Re: Leg 5 Volvo Ocean race
A different perspective on the race:


(thumbnail)
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Posted by
AGage


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2012-03-25 10:11:05 - Re: Leg 5 Volvo Ocean race
Sunday 25/03@1000z:



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