The Iranians claim that the 15 British Naval Personnel they arrested were in Iranian territorial waters at the time.
In the last item I posted (just below this one), I suggested that their claim might be based on 1993 Iranian Legislation which lays claim to territorial waters from roughly the centre of the entry of the Shatt-al-Arab to a point 12 nautical miles to the south, plus a similarly wide band of sea to its east. This would have covered the co-ordinates which we produced.
But the Iranians have now produced a map (seen here) which does not seek to make use of their 1993 Legislation. The border they show between Iraqi and Iranian territorial waters is, in fact, very similar to the one we recognise and it is roughly at a 45% angle to the south-east from the central point of the entrance of the Shatt-al-Arab.
The Iranian's claim is that their co-ordinates show the incident to have taken place on their side of this line. They don't seem to be in the game of attempting to claim distinctive and wider territorial waters. Although there is still the possibility that in their pressurising of our personnel, maps making the 1993 claims have been shown to them.
On January 15, the US Military raided an office in Arbil in Iraqi Kurdistan and arrested 6 Iranians and confiscated files and computers. From different reports one or two of those initially arrested (described as diplomats) were later released. The remainder remain in custody and their whereabouts are unknown. The Iraqi Kurdistan authorities (who otherwise get on well with the Americans) have been highly critical of the US in this case.
Iran recently suggested that those remaining in custody could be released in exchange for the 15 Royal Navy personnel. This proposal was firmly rejected by the State Department.
Perhaps a suitable third party with access to both the USA and Iran could seek to negotiate mutually agreed releases, whilst coming up with a formula to show that no-one has lost face. It is called diplomacy.
I must myself be diplomatic and thank calgacus for leading me to the above link