If you were not so condescending with your posts, more FE'rs might bother to answer your posts.
First of all, how can you see a mast from 5 km away at night? Is there a light on the mast or something?
Secondly, how is this any different from any of the other half dozen other active threads that involve ships, lights, and or masts? You keep asking the same questions over and over. Are you expecting different answers, or are you trying to see how many times you can get the same answers?
Finally, Have you even tried this experiment yourself?
RW, you are either a closed minded individual who is just here to get a reaction out of people because you disagree with their beliefs, or just a bad troll. You ask a question, get an answer, then ask again as if it has not been answered. Are you really that lonely?