Navigation unvail'd; or, A new and complete system of navigation in all its branches [electronic resource] : Containing, arithmetic, geometry, trigonometry, geography, and astronomy, in a more plain and easy method than any hitherto published, and more adapted to beginners. Sailing by the plain, and Mercator's or Wright's charts explained from the first principles, and fully illustrated in a variety of useful examples. The theory of the tides, currents, variation of the compass, leeway, &c. particularly considered; and the difficulties in reckoning, which proceed from them, fully explained. A complete set of all the tables useful in navigation, with their construction and use at large. The description and use of the instruments commonly used, and some new ones of the author's own invention. To which is added, a new way of keeping a reckoning on the principles of Mercator's or Wright's sailing, as easily as by the common erroneous method of plain sailing. The whole calculated for practice, and the examples such as occur at sea, in a manner quite different from other systems; being freed from the many superfluities and perplexities which those who have wrote on this subject, have generally made use of, and abounding with variety of rules which are absolutely necessary, and have never before been treated of: performed with the greatest exactness, and approved of by the most eminent mathematicians, of the age. By Edward Hauxley, teacher of the mathematicks.