OutSide Maps is an iPhone/iPad/iPod Touch application that enables you to view and navigate a wide variety of UK Ordnance Survey maps (excluding Northern Ireland) using an easy-to-use touch interface. OutSide Maps also supports WORLDWIDE coverage for OpenStreetMap, OpenCycleMap and the Stamen and Thunderforest map sources.

OutSide Maps uses data supplied by the Ordnance Survey's OpenSpace and OpenData initiatives and supports both on-demand download of map data and bulk downloading for offline viewing via either 3G or WiFi (depending on hardware).

OutSide Maps includes the following features:

- Intuitive "slippy maps" interface
- Native iPad support in both portrait and landscape modes
- OpenStreetMap and derived data is supported at all available resolutions
- OS maps are from country-level down to street mapping including 1:50000 Explorer mapping
- Free on-demand map downloads from the Ordnance Survey via OpenSpace
- Free map pack downloads for offline viewing from the Ordnance Survey via OpenData
- Historic Ordnance Survey data from 1921-1947
- OpenCycleMap support
- Thunderforest "Landscape" and "Transport" mapping support
- Stamen mapping support
- Full Ordnance Survey OSTN02 correction for highest accuracy (+/- 1m accuracy)
- Real-time position tracking via GPS (or WiFi-based positioning)
- Compass and bearing (either using GPS and movement tracking or hardware compass if available)
- "Lookahead" feature when moving at > 5mph
- Waypoints functionality including import and export via GPX format
- OS OpenSpace-driven postcode and placename lookup (online only)
- Grid reference and latitude/longitude lookup (offline)

We apologise for the lack of coverage for Northern Ireland. Northern Ireland is mapped by the Ordnance Survey Northern Ireland who are not currently participating in the OS OpenData initiative. As such, this mapping is not available and we cannot offer it via OutSide Maps.