Philly Investigation Continues
An article in The Day discusses the continuing investigation into how the collision between USS Philadelphia and M/V Yaso Aysen happened, and who was at "fault". (I hypothesized about this in great detail last week):
"Who's to blame — more importantly, who will pay for the damage to the freighter — could come down to a matter of a few degrees.
"If the M/V Yaso Aysen was within a conical area 135 degrees wide behind the submarine, it was overtaking the Philadelphia, and was at fault.
"But if investigators find the Aysen was forward of that area, under maritime law they were crossing, and the Philadelphia would be held responsible. Under maritime law when two vessels are crossing paths, the ship to the left, or port, must yield to the ship on the right, or starboard.
"The issue is complicated by the fact the Philadelphia maneuvered to avoid the collision, so the angle at which they hit was not the angle of the approach, Navy sources said."
It seems it shouldn't be too hard to reconstruct. They'll have the Philly's deck log, and should have the bearings from the periscope observations, which should allow them to figure out the merchant's course fairly accurately -- after all, they have a really good idea what the CPA was (zero). If they got blade rate at all from sonar, or have good radar data, they will have the merchant's speed, and that will be the last piece of the TMA puzzle in figuring out what Yaso Aysen's course was.
Staying at PD...
Update 2303 28 Sep: Longer-lasting version of the article is here, 2nd article down.