I would have though that in 1968, hailing a passing ship for the ship's position was perfectly acceptable and common practice.
OTOH, hailing the passing vessel and asking for the hailer's AIS position is possibly a different matter.
They should really do the in-ports in the traditional craft for the venue:
Newport : 12m
Cardiff : Coracles
Hague : Lee-board barges
Hong Kong : Junks
Melbourne : 18 foot skiffs
Please fill in the gaps.