A SAILOR's guide is a reference book for navigators, providing information on the best routes to take and the safest way to reach a destination. The term 'SAILOR's guide' can be broken down into three crossword solutions: BEACON (6 letters), POLESTAR (8 letters), and STELMO (6 letters). A BEACON is a signal fire or light used to guide ships at sea, while a POLESTAR is a star used for navigation. STELMO is an acronym for Starboard, Taffrail, and Leadline Marker, which are all navigational aids. Together, these three terms provide a comprehensive guide for sailors to use when navigating the seas.