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?
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.
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?