yellow over yellow is a inland towing fellow. this would be a inland towing vessel.
commercial vessel
At night the towing vessel should show two white lights on top of each other to indicate that it is towing.
Look for yellow lights.
Look for yellow lights.
Look for yellow lights.
Inland or International? Pushing, pulling or pulling alongside? Inland Lights and Shapes Rule 24 (c) A power driven vessel when pushing ahead or towing alongside, except as required by paragraphs (b) and (i) Covers composite units) of this rule, shall exhibit: (iii) Two towing lights (yellow) in a vertical line. (i) Notwithstanding paragraph (c), on the Western rivers (except below the Huey P. Long bridge on the Mississippi River) and on waters specified by the secretary, a power-driven vessel when pushing ahead or towing alongside, excepts as paragraph (b) applies, shall exhibit: (i) sidelights; and (ii) two towing lights (yellow)in a vertical line.
White lights displayed above cabin
White lights displayed above cabin
A tugboat pulling a barge will display yellow lights when underway. Be careful not to go between the barge and the tugboat though!. There is a thin line connecting the two. A man once killed his whole family by hitting that line.
"Red or orange" skier down flag
Keep clear of the ferry or towing vessel.