The Navitimer was special in a number of ways; what was especially useful for pilots was the navigational computer built into the watch. The rotating bezel functioned as a slide rule, giving pilots the ability to calculate remaining distances, fuel consumption, and other critical flight equations. Its rotating bezel functioned as a slide rule. Used as a navigational computer, it gave pilots the ability to calculate remaining distances, fuel consumption, and other critical flight equations. Our official warranty in many ways mirrors those of a number of the watch manufacturers and covers the proper timekeeping of the movement. It does not cover things like abuse, being dropped, crystals, bracelets, crowns, case parts etc. or water resistance. While we are the sole determinants of what quali.