eecs124:
Thank you. How can I determine if a robot has returned to a certain location then?
What are you using to determine your position?
Setting the throttle at a certain value for a certain time is a very bad way to track position.
Counting revolutions of the wheels is a bad way to track position.
You had hinted that you were interested in position in your original post, but your primary subject was an odometer. What is it that you are actually trying to do? What is your task? What is your goal? In what environment?