Pretty good NTSB report greatly aided by the Voyage Data Recorder data.
The VDR overwrites after 12 hours, unless the crew hits a special button
which they did not do.
However, USCG team which boarded the vessel the next day,
did hit the button just in time to save the data at the time of the allision.
The USCG is undoubtedly right that the primary cause
was poor conning on the part of the Master.
However, they fail to even mention the very poor low speed
maneuvering characteristics of modern single screw tankers.
They explicitly exclude the weather as a factor,
even though the brisk to strong wind would be pushing the stern to port
--- on a loaded tanker most of the windage is aft ---
counteracting the master's attempt to steer to port,
as the yaw during the drifting periods indicates.
Once he got into this situation,
the Master would have had to take pretty drastic action
to be safey clear of the tower, which he did not do.
As usual, the NTSB puts a lot of emphasis on failure
to do all the paperwork required by all the IMO/Intertanko regs
and Teekay's procedures.