How to GetComponent for SteamVR_TrackedObj when script not attached to controller

How do you properly GetComponent of a SteamVR_trackedObj when the script is not going to be attached to the controller in the camera rig prefab that comes in the steamVR plugin. In the code I have below, I keep getting Array Index out of range error. Any insight or guidance would be very much appreciated.

`using UnityEngine; using System.Collections;

public class MovementOverall : MonoBehaviour {

 //This script is attached to the player game object.  It tells the NavMeshAgent component to set its destination for the flag when the 
 // player is alive.  It also has the player rotate in the direction where the laser from the right controller is pointing.  Still working on 
 // what to do with the player once he is killed.

 public SteamVR_TrackedObject trackedObj;
 [HideInInspector] public Transform flag;
 public static UnityEngine.NavMeshAgent nav;

 private bool IsRightDown = false;
 private Vector3 controllerVector;

 void Awake()
 {
     flag = GameObject.FindGameObjectWithTag("Flag").transform;
     nav = GetComponent<UnityEngine.NavMeshAgent>();
     trackedObj = trackedObj.GetComponent<SteamVR_TrackedObject>();
 }

 void Update()
 {
     if (TimeDestroy.isPlayerAlive)
     {
         NavWhenAlive();
     }
 }

 void FixedUpdate()
 {
     IsTriggerPressed();
     FlagReposition();
 }

 void playerRotator()
 {
     Vector3 lookPos = LaserPointer.laserhitpoint - transform.position;
     lookPos.y = 0f;
     Quaternion rotation = Quaternion.LookRotation(lookPos);
     transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * 10f);
 }

 void NavWhenAlive()
 {
     nav.SetDestination(flag.position);
     nav.updateRotation = false;
     playerRotator();
     if (Vector3.Distance(this.gameObject.transform.position, flag.position) <= .001)
     {
         nav.Stop();
     }
 }

 void IsTriggerPressed()
 {   
     SteamVR_Controller.Device device = SteamVR_Controller.Input((int)trackedObj.index);
     if (device.GetTouchDown(SteamVR_Controller.ButtonMask.Trigger))
     {
         Debug.Log("Trigger is down");
         IsRightDown = true;
     }
     if (device.GetTouchUp(SteamVR_Controller.ButtonMask.Trigger))
     {
         Debug.Log("Trigger is up");
         IsRightDown = false;
     }
 }

 void FlagReposition()
 {
     if (IsRightDown)
     {
         controllerVector.x = trackedObj.transform.position.x;
         controllerVector.z = trackedObj.transform.position.z;
         controllerVector.y = .55f;
         transform.position = controllerVector;
     }
 }

} '