Theodolite for Watch, developed by Craig Hunter, is an augmented reality (AR) app that integrates a compass, inclinometer, GPS, and maps into a single app designed for Apple Watch. Originally released in 2009, Theodolite has been a go-to tool for outdoor enthusiasts and professionals alike. The latest version for Apple Watch includes a map screen, waypoint manager, and various customizable settings for enhanced user experience.

On Apple Watch, Theodolite utilizes an AHRS layout to display compass bearing, pitch angle, roll angle, GPS coordinates, and celestial positions efficiently. The app is tailored for Apple Watch Series 5 and later, leveraging the device's sensors to provide accurate data. Users can calibrate the gyro compass for precise bearings and benefit from the app's magnetometer sensor accuracy reporting.