Untitled

  TOWING VESSEL
      +---------+
          |  [Mast] | <-- Masthead Light (white)
              |         |
                  | [Port] (red)    [Starboard] (green)
                      |         |
                          | [Stern]  <--- White Sternlight
                              |         |
                                  | [Towing Light]
                                      +---------+
                                               |  <-- Towline
                                                        v
                                                           TOWED VESSEL
                                                               +---------+
                                                                   |         |    (No masthead light since it’s not under power)
                                                                       | [Port] (red)    [Starboard] (green)
                                                                           |         |
                                                                               | [Stern]  <--- White Sternlight
                                                                                   |  [Bow All-Round Light] (white)
                                                                                       +---------+