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 of manner of sailing. With certain tables and other rules useful in navigation : as also the plotting and surveying of places : the latitude of the principal places in England : the finding of currents at sea, and what allowances is to be given in respect of them /