Orient Point

We sailed past Montauk Point on the east end of Long Island, sailed between the North and South Fork and entered Orient Bay, leaving Shelter Island to port and Orient Point lighthouse to starboard. Unfortunately I forgot that in the US all navigational aids are reversed: red buoys are to the right of channels instead of the left like everywhere else in the world.
I grounded.
It was a soft landing and I managed to kedge the vessel off the sandbank. But my grounding was observed by local sea dogs and it was embarrasing. No-one believed that in the rest of the planet the buoyage system is reversed.
"Yea, right", they said.