The arte of nauigation : conteyning a compendious description of the sphere, with the making of certayne instrumentes and rules for nauigations, and exemplified by many demonstrations. Written by Martin Curtes, Spaniarde. Englished out of Spanyshe by Richarde Eden, and now newly corrected and amended in diuers places. 1579. VVherevnto may be added at the wyl of the byer, another very fruitefull and necessary booke of nauigation, translated out of Latine by the sayde Eden.