This is for the captain of your house!
I remember seeing MacGyver doing an S.O.S this way.
By the way, the flags also have another meaning - they signal other boaters various things.
For instance this shirt also says:
L: stop your vessel
O: man overboard
V: I require assistance
E: turning to starboard
M: my vessel is stopped
Y: I am dragging my anchor
D: keep clear
A: diver down
D: keep clear
D: keep clear
Y: I am dragging my anchor
Tags:
funny for dad, boat flag alphabet, nautical art, boat flags, nautical