INMEA0183Parser parser = new NMEA0183Parser();

ReadOnlySpan<char> exampleMessage = 
    "$GPRMC,215236.000,A,2006.5938,N,09844.6060,W,0.38,343.75,150919,,,A*70";

switch(mess.Type)
{
    case MessageType.RMC:
    RMCMessage mess = parser.Parse(exampleMessage) as RMCMessage;
    //do something with message
    break;
}