Over the weekend I was listening to a Mark Knopler album I had for awhile now. One of the tracks, well the title track, he does duet with James Taylor called sailing to Philadelphia. The song tells of 2 guys going over t' America from England, one a gordie and one a West Country lad and they end up having the Mason - Dickson line named after them, can anyone tell more about this line then, is it something like the Greenich Merdian line and where does it run.

Cheers