You are operating a pwc. what is most likely to create a blind spot that blocks other boats from seeing you?

A PWC is a Personal Water Craft or a water scooter. When using a PWC, what will most likely create a blind spot that will blocks other boats from seeing you is passing too closely behind other vessels. One has to keep a respectable distance from other vessels. Headlight also can also create a blind spot and prevent other users from seeing you.