MB Roadside Assistance - Coordinates?

[bustedbenz]

This is a question that was prompted by being stranded last summer in my grandparents' Mercury, traveling with a co-worker who had AAA - but it took about half an hour to figure out where we were thoroughly enough to tell AAA how to find us, it was one of those "Middle of nowhere" situations.

I now have a GPS that can report (accurately, I assume) latitude and longitude of my current position. I'm assuming that MB uses a system similar to AAA if not the same system, to locate us all when we call in needing batteries and fuel and so forth. Does anybody know, through fact or experience, if I could call them and say "I'm on Road X, in Y state, and my coordinates are Lat by Long" and they could find me that way?

It seems like such a thing ought to be easily possible, but rarely do people have facilities for the things that I think sound easily possible