The Skymap IIIC can output standard aviation RS232 data at 9600 baud or NMEA 0183
format RMC, GGA and RMB sentences at 4800 baud.
NMEA 0183 Data Format
The serial format is 4800 baud, 8 data bits, 1 stop bit, no parity. Each sentence is followed
by a checksum (*hh), carriage return (CR) and a...