Sunday, 3rd December 2006 by

JP found this little building on a seemingly un-inhabited tiny island off Macau. Written on the roof is some Chinese characters and the word "ZAO" - secret lair perhaps?

A bit of investigation let me to this KML file which is a collection of all the VOR and NDBs in the DAFIF database... Um, yeah.

It turns out that the this is the Zao VOR, a VHF Omni-directional Radio Range, which is a worldwide navigation system for aircraft. It broadcasts a radio signal which allows the pilot to calculate exactly where he or she is. This is all explained in great detail on the Wikipedia page.

Thanks: JP