If you have two locations (i.e., two sets of latitudes and longitudes) then you should be able to calculate the direction the person is headed without a function call to the iphone. Draw a few graphs and look at the change in the latitudes and longitudes. Then it's probably sine((change in lats/change in longs)) or cosine. I knew which in 10th grade. I'd have to look it up now.
HOWEVER, if it is a pedestrian application I'd suspect the margin of error of the readings on the 2 locations will be too large to get a good read on the direction the person is heading. In an automobile, different story since they are traveling further between any two readings. It also depends on how precise you need to be.
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