If you've come to this site from the Android Market looking for more information about OS Map, you're in the right place.  Please follow this link for the full product page.

OS Map is a tool to turn your Android phone into a handy Ordnance Survey map, with your GPS position pinpointed on it!  

Features include:

• All OS Map scales available (including 250,000, 50,000, and 25,000).
• Fast resume from standby and fast position updates.
• No subscription fees - uses the free OpenSpace API
• Custom waypoint support 
• Get your location as a grid reference
• Includes a moving, overlaid compass!