The True Wind Converter calculates the true wind information from different input data. The following data are from the NMEA telegrams used: $ - VTG, .... $ - MWV, ... $ - HDT or $ - HDG .... Moreover, it is possible to multiplex 4 NMEA sources for a transmitter (RS422). The NMEA inputs are galvanically isolated from the output and the RS422. As an additional feature, the individual channels can be transmit with every NMEA telegram as an identification, so that the classification of the data sources is possible.