Quote:
Originally Posted by Misosoup
I make only 2 plot and interval is 1min
(i usually use Nomograph writen in Wazoo's Tutorial)
it will naturally cause a accident errors...
I'll try these advices!
Thank you very much!
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1 minute is really too short. Even if you rely on the watch-officer reporting range in a 100m resolution.
Also remember that 1 degree at the default maximum visual range (8km) is 140 meters wide, double if you use the 16km environment. If the sight direction is roughly perpendicular to the target course, then this 140m is the position uncertainty (accident errors as you call it, I think) that matters in speed measurement. Or if the view direction is roughly along the target course (like when you trail from behind, or are directly ahead), then this position uncertainty will show itself in uncertain target course. So one set of plots with 3m15s is even questionable when you rely on the watch-officer reports alone. Unless you take the plots from the icon locations on the map you simply have to average it over time to get something decently accurate.