Panoramascope is a clever, well-designed app for answering one of life's eternal questions, "Hey, what's that mountain?" It quickly downloads terrain data (terrain data can also be preloaded for use when there's no cell signal...like in the mountains) and computes a representation of the 360 deg panorama from where you're standing. You can then easily scroll in, out, and around the panorama and label points with information from a variety of downloadable layer files. The developer has also thoughtfully included the ability to overlay an image over the panorama.

Pretty unique app showing ridgelines visible from a spot with peaks and/or towns IDed. Can drop a photo in to match things up if you have trouble seeing matches holding phone up. Can choose an arbitrary spot to see what you could see. Also can download data for offline use. Biggest down side right now is that peaks over the horizon are named even though invisible-can make things really ugly if looking towards a distant peak with more behind it. (Addition of US peak list gets rid of main earlier objection to peak utility in US).

I've found this and Topo Maps (another of the developer's apps) to be very useful when hiking. Also note that when I contacted the author with suggestions, he was friendly and responsive.

Good planning tool for evaluating the horizon view from a potential dark-sky observing site. Please see my review under the Topo Maps App. Panoramascope integrates well with Topo Maps, does what it says it will do, and is useful before driving hours to a dark-sky site.