Practical navigation or an introduction, to the whole art, Containing The Doctrine of Plain and Spherical Triangles. Plain, Mercator, Great Circle Sailing; and Astronomical Problems. The Use of divers Instruments; as also of the Plain Chart, Mercator's Chart, and both Globes. Sundry Useful Tables in Navigation: And a Table of 10000 Logarithms, and of the Logarithm Sines, Tangents, and Secants. All carefully Corrected. By John Seller, Hydrographer to the King