Object not moving in direction of target

So I am instantiating a missile with this script. The object is instantiating and moving but it's moving in a weird direction and NOT towards specified target object.

I thought it might be the transform of the target might be buggy so I had the script get the transform of another object in the scene, but the missile still goes in a weird direction.

How do I get this missile object to travel in the direction of the target? What am I doing wrong?

public class FireMissile : MonoBehaviour {

     public Transform target;
     public Vector3 dir;
     public float speed = 2f;
     // Use this for initialization
 
     void Start () 
     {
         speed = 2f;
         target = GameObject.Find("ship").transform;
 
         dir = target.position;
 
         Invoke ("elimin", 3);
 
     }
 
     void Update()
     { 
         dir = transform.position - target.position;
         dir.Normalize ();
         transform.Translate (dir * speed * Time.deltaTime);
     }
 
     void elimin()
     {
         Destroy (this.gameObject);
     }
 
 
 }