What does 2 red flags flying at a boat dock mean?

Question

When I left Catalina Island the other afternoon, there were two red flags flying at the dock.

Answer 1

COMMUNISM, otherwise, idk

Answer 2

High wind warning.

http://www.marinewaypoints.com/learn/fla...

(Scroll to the bottom of the page)

Answer 3

pirate ship

Answer 4

Two red flags that look like a triangle in shape is a gale warning.

Two red flags that are square with a black center that looks like a box is a hurricane warning.

Answer 5

LOTS of fresh air.....in the form of HIGH WINDS.

Answer 6

Probably it means that they are dangerous.