[amsat-bb] "6HE" beacon?

Hello,

During latest Comprida Island expedition (GG64, IOTA-SA-024) we heard a strange CW signal "6HE" at 144,470 MHz, CW, pointed aprox. 60 ~ 70 degrees, to the ocean toward Rio de Janeiro. Does anyone has heard anything like that? Seems like a radio buoy but I never listen it on 2 meters. Any ideas? The video:

http://www.youtube.com/watch?v=Xy98eqXrq-k

Flavio PY2ZX