All that the best Satellite Navigation system can do is identify a physical location of an event. The question of its political location - whether it is in Iraqi waters" or "Iranian waters" - is another matter entirely.

The fact that the term "disputed" has been used in relation to the waters concerned is an indication that there is some doubt about these matters. And it would seem common sense when conducting stop and search operations to avoid doing it in territory that is disputed. Why search a cargo ship headed for a port in your control to see if it is carrying cars while it is at sea in any case? Why not wait till it docks?