So to use google maps or blackberry maps as a GPS do I need to subscribe to some sort of GPS service and pay a monthly fee?

Google doesn't support GPS except on Helio. BBMaps is covered here
Stinsonddog's Blackberry GPS Tips

To use google maps or blackberry maps itself is free of charge. As for GPS goes, I believe you need to purchase a GPS receiver and then download a software for it to work with. Correct me if I'm wrong..

bharned look no farther than Stinsonddog for your GPS questions. You have received a response from the correct resource my friend!