I don't believe that's true. I listened to the youtube of that interview. Dad says nothing about George looking for street signs or not knowing what street he was on. He says that George was going to look for an address for the police. Listen from the 1:40 mark to 2:15.
You implied that Zimmerman was lying and you appear to have based it on a falsehood. Explain to us how you got that wrong.
Link to father’s interview - http://www.youtube.com/watch?v=a9oNoQQbjPA