I am trying to plot points on a map for each ship locations (lat/long),
where
each point is a line whose angle (degrees) denotes ships heading and whose
line length denotes it's speed. Unfortunately arrows(); p.arrows (sfsmisc)
and ms.arrows (TeachingDemos) require start and end coordinates but I only
have a single coordinate and an angle to work with. Can you suggest any
other packages or commands that might allow me to plot this? Alternatively,
can anyone suggest a method of making 'angle' a vector quantity when using
the arrows function? Any advice would be much appreciated!
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