The MTECH VOLMET system combines the power of voice ATIS and a digial ATIS in one reliable and easily configured application. The AVBS VOLMET system enhances the ATIS functionality by adding a graphical interface to control the scheduling of VOLMET broadcast messages.The VOLMET system operates in 4 modes:Mode 1. Fully autonomous mode, updated at scheduled times, or on receipt of METARS and SPECIS.Mode 2. Interactive, with Operator approval of Publication.Mode 3. Fully manual VOLMET preparation and Publication.Mode 4. Special Message Mode [fixed message with no updating. ]The system has been designed with COTS hardware where possible and in an industry standard operating system. For high availability a dual server configuration option is available. The system is fully compliant with relevant SARPs including ICAO Annex 3 & 11 Eurocae ED89 and WMO 306 , where applicable to VOLMET.