Theodolite | Download for iPhone

A multi-function viewfinder and augmented reality app that intergrates a compass, two-axis inclinometer, rangefinder, GPS, map, nav calculator, and geo-overlay photo/movie camera. Has many uses, some of which are for land measurements, outdoor sports, sightseeing, navigation, and finding your way around. Great for surveyors, geologists, architects, engineers, sportspeople, first responders, military staff, and search and rescue workers. Price: $9.99 Device: iPhone.