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The Introduction from A Program to Calculate Winds Aloft using a Hewlett-Packard 25 Hand Calculator, Brian W. Finke, National Weather Service (NOAA), FEB 1977.

A method of calculating winds aloft data from theodolite observation is offered without resorting to the use of plotting boards. This program, utilizing the Hewlett-Packard 25 hand calculator, was originally intended for fire weather mobile unit use at going fires where time and space are at a premium. No new theory has been developed. The tangent plane approximation is the only compromise; but within the accuracy of the observations, this approximation results in no error.

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