Would you know where I could get a formula to determine
the angle of travel between two cartesian coordinates. For example:
someone travelling on a ship knows the degrees-minutes-seconds of the start
and end location. Based on a calculation, they set their compass to an
angle between 0 and 360 degrees and that is the direction the ship is to
travel. The formula should have some considerable degree of accuracy.
You can derive one using a textbook on plane geometry and algebra.
But, if you are really talking about a ship, then you are talking
not about plane geometry and Cartesian axes, because the surface of
the Earth is not a plane but a sphere. Hence you need a textbook on
spherical trigonometry and/or navigation.
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Update: June 2012