How does NavMeshAgent.SamplePathPosition work?

I'm trying out the Unity (Pro) NavMeshAgent and I've hit a road block with the NavMeshAgent.SamplePathPosition() function.

From what I understand, the purpose of this function is to examine a specific area of the path that is X units in front of the agent along the path to the agent's destination. Is this correct? (If not please point me in the right direction)

If my presumption is correct, I've set up an object (myAgent) and applied the NavMeshAgent component, and I have created a target (myTarget) for it in my scene.

Here is my code that is attempting to test the location 10 units in front of my agent along the Agent path:

 NavMeshHit navhit;
 
 myAgent.SamplePathPosition(NavMesh.GetNavMeshLayerFromName("Default"), 10f, out navhit);
 
 Debug.Log(navhit.position); //this is the same as myAgent.transform.position

However, it seems that no matter what value for the MaxDistance (the 10f), the position that is being tested is always the location of the Agent. Am I totally using this function incorrectly?

My ultimate goal is to look ahead on the agent path and get the Vector3 position of the navhit.

Thank you for any help you can provide.