I have never played those games, so I really don't know how you could even (if possible) intertwine Google Maps to the game. But I can offer this solution. http://mapper.acme.com/
I use that with my GPS and when I plan my flight in the Flight Sim. So with that in mind. Just write down the coordinates (acme mapper takes several formats) and input them into the search box of the website. It will drop a balloon.