Sports helmets, motorcycle helmets, bicycle helmets, military helmets, police helmets, firefighter helmets, car racing helmets, go-cart helmets, safety helmets; eyewear, namely, sunglasses, prescription glasses, prescription-free glasses, computer gaming glasses, eyeglasses, contact lenses, sports glasses, shooting glasses, hunting glasses, 3D glasses, safety glasses, protective glasses, sailing glasses; ski goggles, night vision goggles, military goggles, sports goggles, swimming goggles, kite boarding goggles, windsurfing goggles, water sports goggles, parachuting goggles, paragliding goggles, base jumping goggles, paintball goggles, motocross goggles, mountain bike goggles, snowmobiling goggles, snowboarding goggles, computer gaming goggles, helicopter pilot goggles, airplane pilot goggles, bobsleigh goggles, luge goggles, safety goggles, protection goggles, shooting goggles, hunting goggles, wake boarding goggles, surfing goggles, waterskiing goggles, mountain climbing goggles, face masks for diving; head mounted displays (HMD), namely, head or helmet mounted optical displays; head mounted display systems (HMD systems) comprising HMD and built-in or external hardware for generating data to be displayed on HMD; heads-up displays (HUD), namely, transparent displays that present data without requiring users to look away from their usual viewpoints; heads-up display systems (HUD systems) comprising HUD and built-in or external hardware for generating data to be displayed on HUD; inertial measurement units (IMU) comprising accelerometers and gyroscopes for measuring and reporting attitude, position, movement, velocity, angle, orientation and gravitational forces; software applications, namely, desktop and web applications for displaying and overlaying on maps data downloaded from HMD, HMD systems, HUD, HUD systems or IMU and for processing, filtering, sharing or manipulating such data; smartphone applications and mobile phone applications for adding functionalities to HMD, HMD systems, HUD, HUD systems or IMU and for storing and displaying data from HMD, HMD systems, HUD, HUD systems or IMU; computer software platforms for developing desktop and web applications, mobile phone applications and smartphone applications for use in association with HMD, HMD systems, HUD, HUD systems or IMU