Map symbols
 

Does anyone know what the Maltese cross and letters stand for on old maps? this one I believe from 1620s shows some examples of field/ enclosures near Amble (ok, Ambell :)) marked with letters followed by one or two maltese crosses. The letters appear to have three options: "A" "M" or "P"

just been googling this one for half an hour with no result.

is it to do with ownership of the land?

http://books.google.co.uk/books?id=j...%20map&f=false

any luck?

could be, I'll see if I can find any other maps from this period online .