With my experience on the map function, I see that you can have current location and current address field for that record.
My question is,
Is it possible to have a map layout page with every address field from the database enetered into the map, so when you are looking at it, it pulls up red dots all over the city of present clients?
Google Maps has an API (Application Programming Interface) available and documented.
What you ask is not easy..
Google's Map API FAQs https://developers.google.com/maps/faq
Google "mulitiple map site:forums.filemaker.com"