How do I get the flag?

Hint 1 of 7:

Start by climbing up.

Hint 2 of 7:

Once you are up, what direction can you go?

Hint 3 of 7:

Down, obviously . . . and port.

Hint 4 of 7:

I hope you saved the game?

Hint 5 of 7:

There is another interesting thing you can do while you are up the
mast.