This question has popped up a lot recently. The simple answer is no. The more-longer winded answer is “not without a lot of extra work on your part”. If you really want multiple different maps in Mapsource, you’d be better off making them yourself using mkgmap.

  1. Download the Europe extract from geofabrik
  2. Extract the five countries you want from this Europe extract using osmosis or splitter
  3. Create the map using mkgmap