The sea-man's practice, : containing a fundamental problem in navigation, experimentally verified: namely, touching the compass of the earth and sea, and the quantity of a degree in our English measures. Also, an exact method or form of keeping a reckoning at sea in any kind or manner of sailing. With certain tables and other rules useful in navigation: As also in the plotting and surveying of places: The latitude of principal places in England: The finding of currents at sea, and what allowance is to be given in respect of them. /