input.location not updating on Iphone

I'm building a simple location based game using GPS. I used some example code, but it seems the GPS is not updating after the finding the initial position. It only updates if i swap apps or something. For our game I need it to update every few seconds. I tried putting the "input.location" in the Update class, but got the same results. I'm using an Iphone 4 with IOS 5.1 and unity 3.5.5

Here is roughly the code i'm using:

 using UnityEngine;
 using System.Collections;
 
 public class question : MonoBehaviour {
     
     public float mylat;
     public float mylong;
     
     public float posScale = 1;
     public Vector2 globalPos;
     bool gpsRunning = false;
     public float gpsAccuracy = 100;
     public float gpsUpdateDistance = 10;    
     private bool ready = false;
     public TextMesh coordText;
     
     Vector2 MDMloc =  new Vector2(49.267356f,-123.090309f);
     
     // Use this for initialization
     void Start () {
         globalPos = new Vector2(MDMloc.y,MDMloc.x);
         StartGPS();
     }
     
     // Update is called once per frame
     void Update () {
             
     //    globalPos.x = Input.location.lastData.latitude;
     //    globalPos.y = Input.location.lastData.longitude; 
         
         mylat = (globalPos.x % 1) * 1000;
         mylong = (globalPos.y % 1) * 1000;
         transform.position = new Vector3(mylat*posScale, mylong*posScale, transform.position.z);
         coordText.text = "iphone gps: (" + globalPos.x + "," + globalPos.y + ")";
         coordText.renderer.material.color = new Color(1,0,0);
         
     }
     
     IEnumerator ActivateGPS() {
         gpsRunning = true;
         Input.location.Start(gpsAccuracy, gpsUpdateDistance);
         if (Input.location.status == LocationServiceStatus.Running)
             Debug.Log("**** LocationService Running");    
         
         float duration = 0;
         while (duration < 20.0f) {
              
             if (Input.location.status == LocationServiceStatus.Running
                 || Input.location.status == LocationServiceStatus.Failed) break;
             yield return new WaitForSeconds(0.1f);
 
             duration += 0.1f;
         }
             
         if (duration >= 20.0f) {
             Debug.Log("**** LocationService Timed out");    
         }
         
         if (Input.location.status == LocationServiceStatus.Failed) {
             Debug.Log("**** User declined LocationService?");
             gpsRunning = false;
         }
                 
         while (Input.location.status == LocationServiceStatus.Running) {            
             globalPos.y = Input.location.lastData.latitude;
             globalPos.x = Input.location.lastData.longitude; 
             
             yield return new WaitForSeconds(2.0f);
         }
         
     }
     
     public void StartGPS() {
         if (Application.isEditor) {
             return;
         }
         
         if (!gpsRunning) StartCoroutine(ActivateGPS());    
     }
 
     
     public void StopGPS() {
         Input.location.Stop();
         gpsRunning = false;
     }    
 
     void OnApplicationQuit() {
         StopAllCoroutines();
         Input.location.Stop();
     }
 
 }