Close. It's a tool for creating Rando Ramble routes.

The 4 points are the 4 ride start locations I use for rides. The radial lines get me out to the beltway in fairly even compass increments. With these I can extend a route outward from that radial line, go 80 or so miles and come back to the end of another radial line, preferably one that is linked to the same start point. If it isn't, I can use the connectors to get me back to my original start.

You might notice there's no connector between Canton and Carroll park. The only route that would stop/start between these two would be a long one- up and over the Susquehanna, past Elkton, down Delmarva and over the rt50 bridge to Annap. and back up to Baltimore. Or, I guess you could ride down to Norfolk and get a ride over the bridge/tunnel, and ride back up to Elkton and over. Only 600 miles.