Ummm--seeing how many funny shaped thingys he can get up his mast? /forums/images/graemlins/confused.gif Whilst engaged in towing something over 50M of course.
That could be the line of a path on the grassed area in the background.
In which case the tug's skipper is too idle to take down his shapes - rather like the typical fisherman who also leaves his "basket" on display when not engaging in the task in question. /forums/images/graemlins/tongue.gif
Out of interest, do you show such a shape when you are fishing on your boat or does it only apply to vessels above a certain size or of a commercial status?
Ship restricted in her ability to manoeuvre.
daymark: black ball over black diamond over black ball
lights: red over white over red
Besides, she's making way, hence shows also navigation lights.