Nav-Finder slate, Nav-Finder Instructions for Use allows you to get around underwater with ease. There are no street signs on the bottom of the ocean. The reef is not on the corner of 3rd and Elm, so you need to use compass bearings to get from place to place and to the boat or shore and back again. The Nav. Finder is your ticket to navigational success. Nav. Finder comes complete with instruction manual detailing the step-by-step procedures to understand its use and important applications to increase your diving efficiency.