Neither Is Any Man Able By Learning Onely, Except He Trauaileth As I Haue Done.

For as it may be truely saide of Nauigation and Hydrographie, that no man can be cunning in the one which wanteth conuenient knowledge in the other:

And as neither of them can be had without the helpes of Astronomie and Cosmographie, much lesse without these two grounds of all artes, Arithmetike and Geometrie: so none of the best learned in those sciences Mathematicall, without conuenient practise at the sea can make iust proofe of the profite in them: so necessarily dependeth art and reason vpon practise and experience. Albeit there are diuers both learned and vnlearned, litle or nothing experienced, which in talke of nauigation will enter deeply and speake much of and against errours vsed therein, when they cannot reforme them. Such also haue written thereof, pretending singular great knowledge therein, and would so be accompted of, though in very deede not worthy the name of good and sufficient pilots. To whom I thinke it shall not be amisse in defence of rules builded vpon reason, and in practise allowed, thus much to say for answere. It is so, that there are rules vsed in nauigation which are not perfectly true: among which the streight lines in sea-cardes, representing the 32. points of the compasse or windes are hot holden to be the least, but noted of such talkers for principall, to condemne the occupiers thereof for ignorant: yet hath the famous and learned Gerardus Mercator vsed them in his uniuersal mappe.

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