It seems that this guy in Sitka, Alaska built a house and lighthouse and had it approved as an Official Navigational Aid by the US Coast Guard as the Rockwell Lighthouse. The place is  for sale (January 2012). Attached below is the advertisement from Sitka Realty service.

Anyone interested? It’s a steal!

Some lovely photos of the inside and outside of this house on Old House Dreams website.

As for the term Official Navigational Aid, Canada also does it sometimes.