How do I go from one point to another? (GPS used for my AVG)

sora628:
I'm building an Autonomous Ground Vehicle and it's coming along nicely except I'm having 2 problems---One) I don't know how to actually get the (rc) car to go from one place to the next---Two)

How far apart are "one place" and "the next"? A few meters? A few kilometers? A hundred kilometers?

Great circles will hardly be necessary for short distances.

I'm having trouble with obstacle avoidance

What sort of trouble?