Well, on the Helio Ocean, it comes with Google Maps installed. Google Maps you can always jump to your current location with a single button press, do searches for stuff in the area just like on the normal iPhone, and get visual directions from where you are, that update as you drive them. On the Ocean, you can pay a monthly fee for a different program that has voice directions (I haven't tried it so don't know how good it is).
Another thing GPS allows, the Ocean has a program where you can tell it which friends have Oceans as well, and then you can see where are all your friends are on the map. It'd be great for finding eachother in the mall and stuff, or just see if any of your friends are nearby, if you could convince all your friends to buy the same phone you did 🙂