Concur. Also be aware that even though a gps is accurate to a couple of metres, the georeferencing of the maps can be out by up to a couple of miles in parts.
Airservices have done a very good job in fixing the maps so they are quite accurate now, but it's not perfect and land marks dont always line up 100%. Most are good to probably 100m or so.
Plan a 2nm buffer and you can't go wrong.