High Quality Content by WIKIPEDIA articles! Radiofax, also known as weatherfax (portmanteau word from the words "weather facsimile") and HF fax (due to its common use in the short waves), is an analogue mode for transmitting images in grayscale. It was the predecessor to slow-scan television (SSTV). Facsmile machines were used in the 1950's to transmit weather charts across the United States via land-lines first and then internationally via HF radio. Radio transmission of weather charts provides an enormous amount of flexibility to marine and aviation users for they now have the latest weather information and forecasts at their fingertips to use in the planning of voyages.

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