output device Generally Line printer and CNC plotter And other scanning devices (such as laser scanner, etc.). Geographic data is exported in graphical form in addition to tabular form. That is, the computer draws various thematic maps according to the drawing requirements. Sometimes, in order to further process or scan and store data, it can also be recorded on tape in a certain format, such as digital maps. NMEA 0183 is a standard for digital signal transmission in navigation and maritime transport, which defines the requirements for electronic signals transport protocol , data transmission time, and the information format needs a 4800bps serial data interface 。 The device needs to have an information source and a receiving end. The transmitting end sends data to another NMEA 0183 device. The information source and the receiving end are respectively used to transmit and receive 8-bit ASCII data.
