GREAT CIRCLE ROUTE

Lieut. Jack O. Horton, Jr.

Peer Reviewed

Abstract: INTRODUCTION THE STANDARD PROCEDURE for determining a great circle route commences with the selection of the proper flight planning chart, one on which a great circle represents-or closely approximatesa straight line. Gnomonic and Lambert conformal projections are ideally suited for this purpose, for accurate great circle coordinates can be taken directly from the line joining departure and destination. However, when such charts are not available, the great circle route must be obtained by some other means, such as H.O. 211 computation. This unfortunately, is a rather detailed process, entailing considerable patience and a special knowledge of the tables. In its place I recommend the following method which, besides being less complicated, is readily available to every navigator familiar with the H.O. 249 solution of the spherical triangle.
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 15, Number 3
Pages: 257 - 259
Cite this article: Horton, Lieut. Jack O., Jr.,, "GREAT CIRCLE ROUTE", NAVIGATION, Journal of The Institute of Navigation, Vol. 15, No. 3, Fall 1968, pp. 257-259.
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