A problem in the calculus of variations. Let a vessel traveling at constant speed navigate on a body of water having surface velocity

			(1)
			(2)

The navigation problem asks for the course which travels between two points in minimal time.

Sagan, H. Introduction to the Calculus of Variations. New York: Dover, pp. 226-228, 1992.

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Weisstein, Eric W. "Navigation Problem." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/NavigationProblem.html