This may have been mentioned earlier in the thread (haven't time to check) but there is a transcript and radar video around, that seems to show that the frigate had her AIS turned off until the very last moment, ( in stealth mode) so that the tanker and VTS (Shore control) had no idea that she was there, seeing only an 'unknown ship' approaching on radar. The frigate seemed to have no awareness of the tanker's position nor was willing to take instructions from her. They also seemed frightened to turn even slightly to starboard as instructed, ( due to fear of the shoreline) which would have narrowly avoided a collision, but instead turned to port across the tankers bows thus ensuring the collision. The frigate seemed be surprised eve after the collision, and to not even know what hit her. Her AIS was turned on only at the moment or shortly after the collision. Complete and utter lack of situational awareness and procedure, implying complete incompetence. This is very surprising from the Norwegians, (though the US Navy has form)