WEFAX is a radio fax transmission service for ships that broadcasts weather maps and satellite photos. Reception requires SSB-USB mode tuning and can be decoded using PC software like Fldigi or mobile apps. Many WEFAX stations are shutting down worldwide, making it an urgent time to receive transmissions from active stations like JMH in Japan, Kyodo News, and HLL2 in South Korea.
Radiofax is an analogue mode for transmitting grayscale images via HF radio waves, invented by Richard H. Ranger at RCA in the 1920s. It was the primary method for sending photographs from remote sites from the 1930s to 1970s and remains in limited use for transmitting weather charts to ships at sea.