I have a content type with multiple location fields

eg. Node Type = Product
Location1 = Manufacture Location
Location2 = Assembly Location
Location3 = Dealer Location(s)

I'm trying to build a map view that shows *only* the manufacture locations for multiple nodes - is this possible?
I can get a map of locations for the nodes, but the locations include all of the locations. It seems that for each node, the map is all-or-nothing for locations. Can anyone please give me some pointers?