In diplomatic contacts, Iran had provided Britain with an initial set of coordinates for the position of the boats that placed the incident in Iraqi waters.
“We pointed this out to them on Sunday in diplomatic contacts,” Vice Admiral Style said. “After we did this they then provided a second set of coordinates that places the incident in Iranian waters” over two nautical miles away from where they were said to be by Britain, he said.
“It is hard to understand a legitimate reason for this change of coordinates,” he said.
Link from NYT