The San Jose Mercury News article Looking like a seagoing Dr. Octopus, SpaceX’s Mr. Steven has added four longer, articulated arms talks about recent modifications to the size of the net on SpaceX's ship Mr. Steven.
Studying Mr. Steven more carefully, I see two sets of markings I don't recognize. The first is what looks like three 4-blade propellors, and the second has a series of horizontal lines and a horse-shoe type shape with antlers.
What do these mean? Are they related in any way to Mr. Stevens' job of catching fairings from the sky?
Full size image can be found at https://www.mercurynews.com/wp-content/uploads/2018/07/0524_nws_tdb-l-mrsteven-05247.jpg