Rugged gps watch is water-rated to 100 meters and constructed to u.s. Military standard 810 for thermal, shock and water resistance.built-in 3-axis compass and barometric altimeter plus multiple global navigation satellite systems (gps, glonass and galileo) track in more challenging environments than gps alone.dedicated tactical features include jumpmaster mode, waypoint projection, dual-position gps format and preloaded tactical activity.go dark with stealth mode to disable wireless communication and data sharing