By Hunter Research and Technology, LLC

Score: 4.5
From 1,595 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).



  • Review

    By Tasha-B
    Great application for any outdoor activities. Very accurate.
  • Where are you?Houston

    By Fishdoctor2
    Great app to provide you detailed information on your location relative to the surroundings. Also great for documenting photographs that need location information as part of a record. Highly recommended.
  • Great app

    By sbfireman
    Very functional and easy to use. Should be in everyone’s geospatial toolbox
  • Flat earth

    By Scepticdoc
    Amazing app! I have used it for several years. Works best with a tripod. And it always helps to take notes. Especially useful for me in estimating distance and elevation to a waypoint while hiking. Thanks!
  • Very Useful....

    By Phil Babe
    ...for maritime Nav.
  • Buy this App

    By trailbuilder
    I build MTB Trails, I use this app more and more. Why carry an inclinometer when I always have my phone. I use the video feature of Theodolite too. I take distances and capture in a pic. I get Trail approved using these features. Great app.
  • Handy Tool

    By austineats
    I picked up this app several years ago. I don’t have a professional use for it but it has been fun and handy to have on my phone. I’ve used it to measure slopes for trail building, calculate tree height while felling trees near the house, and to settle arguments.
  • Awesome!!

    By rneuner
    Best app
  • Very useful

    By ScooterMiami
    Excellent device. Best handy field tool for establishing locations.
  • Theodolite

    By 4417Lee
    This app will not run on iPhone 5.