Plane sailing

Departure p and the difference in latitude ΔφAB can be worked out with simple trigonometry.

Plane sailing (also, colloqually and historically, spelled plain sailing) is an approximate method of navigation over small ranges of latitude and longitude. With the course and distance known, the difference in latitude Δφ_AB between A and B can be found, as well as the departure, the distance made good east or west. The difference in longitude Δλ_AB is unknown and has to be calculated using meridional parts as in Mercator Sailing.

单词	Plane sailing
释义	Plane sailing 英语百科 Plane sailing Plane sailing (also, colloqually and historically, spelled plain sailing) is an approximate method of navigation over small ranges of latitude and longitude. With the course and distance known, the difference in latitude Δφ_AB between A and B can be found, as well as the departure, the distance made good east or west. The difference in longitude Δλ_AB is unknown and has to be calculated using meridional parts as in Mercator Sailing.
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