THE FRANKLIN PILOTING TECHNIQUE

Ernest B. Brown and Bryon E. Franklin

Peer Reviewed

Abstract: Introduction IN A MARINE PILOTING situation in which the navigator is not getting good fixes, he must take immediate steps to verify whether there is an unknown systematic error. Of prime importance is the fact that if a systematic error appreciably larger than the net value of random observational and plotting errors is incorporated in the plot, the fix position will be outside the fix triangle if the spread of bearing observations is less than 180 degrees. Even when piloting within enclosed waters, the navigator is frequently limited to bearing spreads of less than 180 degrees. This may be because of a scarcity of aids to navigation or an inability to identify charted features or aids to navigation which could otherwise be used to provide good angles of cut and assurance that the fix would be inside the fix triangle. With an outside fix, in general the larger the fix triangle the greater will be the discrepancy between a fix assumed at the center of the triangle and the position of the intersection of the bisectors of the appropriate exterior angles and opposite interior angle.
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 14, Number 2
Pages: 157 - 156
Cite this article: Brown, Ernest B., Franklin, Bryon E., "THE FRANKLIN PILOTING TECHNIQUE", NAVIGATION, Journal of The Institute of Navigation, Vol. 14, No. 2, Summer 1967, pp. 157-156.
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