While it is called mowing the lawn, it is not efficient to directly overlap paths, you just keep moving the entire racetrack over..
Agreed, but AIS data I have just seen from Ocean Shield indicates they are more focused around 21°06'S 103°54'E, and the latest positions indicate the vessel is crabbing its way to the north again on 293°/113°T tracks.
The latest position at 10/04:50 UTC is 21°08.5'S 104°10.2'E and heading 113°T. The speed is currently 1.7 KTS.