The Navigator's Guide, to the Oriental Or Indian Seas:: Or, the Description and Use of a Variation Chart of the Magnetic Needle, Designed for Shewing the Longitude, Throughout the Principal Parts of the Atlantic, Ethiopic, and Southern Oceans; Within a Degree, Or Sixty Miles. With an Introductory Discourse, Concerning the Discovery of the Magnetic Variation, the Finding of the Longitude Thereby, and Several Useful Tables
