How to use NavMeshAgent.updatePosition

According to the official documentation, when I set the updatePosition to false, I can use the agent's simulated position to drive another component. But where can I get the "the agent's simulated position". In my testing(agent.updatePosition = false), I find the agent.remainingDistance works well even if the transform don't change.

http://docs.unity3d.com/ScriptReference/NavMeshAgent-path.html