vendee globe speed and distances

  maltose 16:41 22 Nov 08
Locked

Two questions bothering me from the excellent VG web site
1. what does "nds" mean as in "average speed nds"?

2. When boat "a" is said to be x nm from the leader. Is this the actual distance between them, irrespective of heading, or the distance boat "a" has to travel to be in a position parallel with the leader?

  peter99co 18:52 22 Nov 08

nm = Nautical Miles

  peter99co 18:56 22 Nov 08

nds probably Nautical Distance Sailed?

  peter99co 18:59 22 Nov 08
  maltose 19:40 22 Nov 08

Well I am grateful for your reponses but they do not help. nds does not mean knots but it is a speed of some sort I certainly suspect the n is Knots. It makes no sense as distance sailed.

The web site, which I praised in my first thread entry does not appear to have explanations for either question. Or perhaps I should write I cannot find the explanations.

  maltose 19:45 22 Nov 08

I have deduced the answer to my second question. Subtracting the distance to finish for the leader from the distance to finish for boat b gives the distance to leader i.e. it is not the dead line distance.

  peter99co 20:22 22 Nov 08

Found this but is to complex for me

click here

  peter99co 20:24 22 Nov 08

The average speed over the entire path is therefore the total distance traveled, nds, divided by the sum of all the times, which gives ...

?

  maltose 20:47 22 Nov 08

Many thanks an interesting discovery but the VG's nds figures are too volatile to be running total averages. I do however, think you are onto something and it may be average speed knots(n) over a path segment (ds) but what segment, the last day?

  laurie53 21:11 22 Nov 08

Net distance sailed (net as opposed to gross, which would include doglegs)?

Don't mean nuthin to me, just a thought is all.

  DieSse 23:19 22 Nov 08

-
Your quote actually means

n (ie the number of elements

?s - Delta s - as used in calculus (I don't know whether the symbol for delta will come out correctly, and d is just another way of writing it).

So I don't really think it's relevant.

There doesn't seem to be a definition anywhere on the web. I suspect it could be the net daily speed.

Calculated as the net distance traveled in a day (as opposed to the gross distance.)

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