Join Date: Feb 2010
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Re: Path used to compute bearing and distance by GPS?
As I understand the question, the OP is asking whether calculated bearing and distance consider that the earth is not perfectly round. Clearly, the GPS knows where the destination is located. The question is one of accuracy and efficiency of the route to get there, but only on a theoretical basis. Of the roughly 25,000 mile circumference of the globe I think the equator and the longitudinal distances are only off by about 40 or 50 miles. Theoretical it is. You are going to arrive at the proper destination, you simply may be a short distance to the side of the most efficient course.
I believe the WGS84 datum considers the distance from the center of the earth, as well as it's two dimensional location on the surface. Therefore, it would stand to reason, it calculates distance and bearing, using this out of round shape. I can't say for sure, it does.
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