You can purchase a map of the northeast corridor trails for your gps from
http://backwoodsgpstrails.com/Shoppi...e7546bac9d7b2e
or from
http://www.sledgps.com/
I have the map from sledgps.com and use it with a Garmin Nuvi 550. It is not complete and does not have all club trails but has the main corridor trails and some of the connecting trails.
As you ride, you can then collect waypoints at trail junctions and begin to build your own personal database.