Panoramascope: Augmented Reality computes the skyline visible from your current location and shows it on top of the iPhone's camera view. Peaks and other points of interest are labelled:
Or if you're not on a mountain, select a viewpoint by searching from hundreds of thousands of placenames*:
Or you can enter GPS coordinates or a grid reference.
* Placename coverage is variable depending on location. Please check before buying if coverage is important to you.
Pan around and zoom in to the view using standard multi-touch gestures:
To learn more, explore the rest of this site starting with the user guide. You can buy the Panoramascope on the App Store.