## Description and Use of a Diagram of Navigation: By which All Problems in Plane, Traverse, Parallel, Middle Latitude and Mercator's Sailing May be Instantly and Accurately Resolved. Adapted to the Capacity of All who Know the Use of Figures. Designed as an Easy Introduction, by Sensible Demonstration, to the Principles, and the Practice of Navigation. With a Diagram Engraved |

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acute angle angle 32 deg angle be equal arc of latitude arc or angle circle co-sine co-tangent column contiguous angle course 3 pts course and departure Course and Diff course and distance departure 84 diagonal Diagram of Navigation diff lat difference of lati difference of latitude difference of longitude direct course dist distance 104 distance and departure distance sailed Example.—A ship sails find the course give the course give the diff give the distance given Given—both latitudes Given—one latitude Given—the Hence these solutions Hence this solution index remaining index set index to meet Merca Mercator's sailing merid meridional difference middle lat miles parallel sailing plane sailing proper difference radius be equal reckoning required the course right-angled plane triangle Rule.—Set the index secant set the index ship in lat side adjacent side as radius side marked equator tangent Theorem.—In a right-angled tides tude