Update 4 April 2012 - The OpenStreetMap licence change and server upgrade means that edits made to OSM will not, for now, appear in OOM, until further notice.
Update 5 March 2012 - Due to resource issues, the Sweden and Belgium live versions have been disabled - please use the Global version.
News: Version 2 is on the way and will be released this summer!
There are currently two versions - UK and Global.
The Global version does not receive updates from the main OpenStreetMap database. A new copy of the OpenStreetMap database will be imported in occasionally, but this may be a few months out of date.
There is also a UK version that is updated live from OpenStreetMap, so it should only be around a couple of minutes out of date, although this can rise to being a few hours out of date on busy days. You may need to restart your browser to see the changes, is it may cache the old images.
Because the UK version are updated live, you can make changes to the map in OpenStreetMap (use the Edit tab) and then see your changes appear in OpenOrienteeringMap.