The 20,550-cbm Navigator Scorpio (built 2009) got stuck on Haisborough Sand on 3 January.
It was undamaged and refloated two and a half hours later on the rising tide.
The UK Marine Accident Investigation Branch (MAIB) found that the vessel ran aground in restricted waters after the officer of the watch had become distracted by undertaking passage planning and chart corrections, causing him to miss the planned course change and lose positional awareness.
