dxtra.com
— Global Shipping Map
Live AIS vessel tracking — powered by VHF radio (161.975 / 162.025 MHz)
Home
TROPO
Shortwave
AIS (Automatic Identification System) operates on
VHF Ch.87B (161.975 MHz)
and
Ch.88B (162.025 MHz)
Self-organizing TDMA — ships broadcast position, course, speed, and identity every 2-10 seconds