NASA Navtex Receivers
Navtex is a world-wide automated broadcast system of Navigation, Safety, and Weather warnings maintained by countries under the general authority of the IMO (International Maritime Authority). Broadcasts are required to have a minimum coverage of 400 nautical miles, and operate on the Medium Frequency Radio Band. Primarily on 518 kHz, 490kHz, and 4209.5 kHz.

Currently, Navtex is not supported in Australia.