Especially for sub-zones without own map:
If the measure point leaves the sub-zone, you get wrong sizes.
As the waypoint is not required for measure points anymore, four measure points are used and the highest TARDIS factor is used.
Additional the difference between the corrected world posiition and the real world position is used to create an identifier to detect those sub-zone dispositions.
On "normal" maps, the difference is zero.
Especially for sub-zones without own map: If the measure point leaves the sub-zone, you get wrong sizes. As the waypoint is not required for measure points anymore, four measure points are used and the highest TARDIS factor is used. Additional the difference between the corrected world posiition and the real world position is used to create an identifier to detect those sub-zone dispositions. On "normal" maps, the difference is zero.