One that Daddy showed me a couple years ago, happened to have this flag on a fiberglass pole laying around the yard and he stuck it there for an example.
He said when he owned the V, the only thing he had a problem with, was aligning the boat to the trailer at the ramp cause he couldn't see the winch stand over the bow of the boat.
Well it has been just stuck in the hole since, no real need to replace it till someone steals it.
It really does wonders, letting you line up the boat and you have a good idea when it is to the winch.