Getting future astronauts to Mars won't be easy...how would we do it?
I've been thinking about a design for a vehicle to transport men and women to Mars, but I dont know if it will work or not.

I'm wondering is it feasible to place a satellite system into mars that could establish a GPS system like on earth? If so, would this make it any easier to navigate to mars’ surface from space?

both very good questions, i know the Mars society has been working on ideas along these lines, i think its called the mars society