In my Game I require a working space of preferably around a few hundred Km. Looking at previous Questions the answers given are usually either Scale down the scene or use some form of spacial partitioning [breaking down the space into smaller chunks].

At standard scale under 10,000 is mostly jitter free

Unless I'm doing something wrong scaling down the scene doesn't seam to fix anything as if I scale down everything by 100, the "jitter point" just appears 100 times closer so I'm stuck with the same overall world size.

If I go the spacial partitioning route and assuming and I don't have the chunks overlapping [which would make the transitions smoother] increasing the size of the scene cubes for each extra layer 10,000 = 1, 50,000 = 27 , 90,000 = 125 chunks which is an insane number of chunks for the size I require.

Assuming there is a way to convert the Vector3's to double precision floats I would have an insane workspace before the "jitter point" appears [~30au or the distance from the sun to Neptune!!]

SO is there any way to use double precision vector3's or some method I haven't found to allow unity to create Scenes the size I require

Ok ive come up with the following Idea, Any comments / improvements are welcome

    if (check) {
        float dist = Vector3.Distance (transform.position, Vector3.zero);
        if ( dist > 8000f) {
            foreach (GameObject obj in Object.FindObjectsOfType (typeof(GameObject)))                   
                if (obj != gameObject && obj.transform.root != transform.root && obj.layer != 10 && obj.transform == obj.transform.root)                    
                    obj.transform.position -= transform.position;
            transform.position = Vector3.zero;
        }
        checkpoint = ((8000f - dist) / 600f);
        timer = 0;
        if (checkpoint > 0.5f)
            check = false;
    } else {
        if (timer > checkpoint) {
            check = true;
        }
    }
    timer += Time.deltaTime;

Basically it moves the entire world bar anything that is part of the game object this is attached to or anything on layer 10 which I have called "GlobalPosition" but only does this when the player is half a second from the 8km border at top speed.