By Hunter Research and Technology, LLC

Score: 4.5
From 1,562 Ratings


Theodolite HD is a multi-function viewfinder that combines a compass, two-axis inclinometer, rangefinder, GPS, map, nav calculator, and geo-overlay photo/movie camera into one indispensable app. Theodolite was one of the very first augmented reality apps when it was released in 2009, and it’s been downloaded and used by millions of customers since then. Uses are endless, and the app is great for land measurements, outdoor sports, sightseeing, navigation, and finding your way around. Theodolite is a pro grade app and is used extensively by surveyors, geologists, architects, engineers, competitive sportsmen, first responders, military personnel, and search and rescue workers around the world. Theodolite lets you take data-overlay camera images and movies, with 2X-8X digital zoom and fast image processing. You can overlay geographical data, date, time, and custom notes directly on photos and movies for later reference. View your current position on the built in map, with optional new offline Outdoors maps that include topo contours (feet or meters), roads, trails, landmarks, campgrounds, ski lifts, and more. Live map markers continually update distance/heading relative to the current location and also show wayfinding info on the main camera screen. Share map markers and nav calculator points with other users of Theodolite via text messages or e-mail. This powerful capability opens up a wide range of collaborative uses which include team land surveying, accident investigations, spotting of wild fires, triangulation of landmarks, and advanced tactical observation and targeting operations. Theodolite includes features for serious users like a reference angle mode, nav calculator, map marker import/export, data logging with CSV and KML export (via e-mail or iCloud Drive), system-wide clipboard integration, percent grade display, mil compass readout, optical rangefinders (including a mil-based reticle, sniper-style stadiametric graphs, and a variable 4X-24X scope), and colored lens filters to improve use in dark conditions and preserve night vision. Theodolite can provide location in military grid reference system (MGRS) coordinates, Universal Transverse Mercator (UTM) coordinates, British/Irish National Grids, US National Grid, Maidenhead locator system, and six latitude/longitude formats. Optional US State Plane coordinates include SPCS27 and SPCS83 zones covering all US States. The optional Datum Pack adds over 230 geodetic datums to the app for more accurate position computation from GPS data, covering regions and countries on all continents around the world. With an optional in-app purchase to enable team tracking, you can share location with up to 20 people on Theodolite's map. Team tracking was developed in conjunction with search and rescue experts to offer a good balance between simplicity and performance. Theodolite has been shown in Apple Keynotes, featured on the App Store, and has been a #1 selling Navigation app in App Stores around the world. Since its introduction in 2009, Theodolite has defined augmented reality navigation. The app continually introduces new technologies, pushing the limits of iOS app development and taking advantage of new hardware capabilities. Find out why Apple named Theodolite one of the most amazing apps available and showed it being used to explore the Great Wall of China. Where will you take it on your next adventure? Theodolite requires an iPhone or iPod touch (see the “Theodolite HD” app for use on iPad).



  • Love it!

    By gkswensen
    I love using this app every time I head up into the mountains especially on jeep trails.
  • Helpful

    By SneadCo
    This has been helpful to us when laying out buildings in our area. I am in the Shenandoah Valley and a lot of what we build is on the side of a hill. Very good tool for getting an idea how things lay before we get to the detail site plan. Also used this for clearing tree tops for satellite dishes.
  • Great

    By luvoldshit
    Works great
  • Great app!!!

    By KevinJW
    I have been using this app since it was first developed. The app keeps getting better. I work for an engineering company and I use it as my secret tool when doing bid evaluation surveys.
  • Excellent quality and feature rich

    By calpalmer
  • Very useful app

    By Drtees
    I downloaded this app because it looked interesting. It has become very important in my field work. The photo feature writes bearing, slope, and azimuth to the photo, which is extremely helpful in illustrating a point.
  • Powerful & Easy to Use

    By TennKen
    This is a great app with many outdoor applications.
  • Accident reconstructionist

    By olerob
    Theodolite provides a fully court accepted photograph with all the necessary identification information.
  • Want to work with Latitude and Longitude?

    By Dedwarmo
    I use this because it allows me to get the Latitude and Longitude of an arbitrary location on the map and then it’s not too much trouble to copy the coordinates from the Theodolite app to any other app on my phone that handles text. December 2017.
  • Great tool

    By MustyEIT
    Awesome tool for taking advantage of a lot of the sensors we always carry around with us anyways - and the clear display on one screen is great.