Originally posted by Essex502
Whether it is technically proper or not ... I have seen a kit from Overton's that mounts a small flag on the light pole for the back of a typical boat. Check Overton's current catalog.
Overtons (http://www.overtons.com)
Search on "flag"
Be careful, I did this on our last cat and it ripped the light pole off the boat. It was ok until about 90 mph, but depending on the size of the flag it could probably happen at a slower speed.