Good luck getting lost with the Spyglass App by HappyMagenta. This has to be one of the best all-round advanced compass and GPS apps available for the iOS devices. The Spyglass App is jammed packed full of useful features employing an every hardware sensor all wrapped up in a display that looks like it comes from a fighter jet. Track every detail of your location from maps, tactical GPS, gyrocompass, milspec compass, waypoint tracker, speedometer, altimeter, gyro horizon, coordinate converter, sextant, inclinometer, angular calculator, and the best part is the 3D augmented reality overlay navigator. We’ve probably missed a few more crucial features, but you get the point. Not only is this app an essential tracking device for the outdoors, but an all-round functional tool for around the house or office.