OpenCPN sait lire ces phases :

HDM - Heading, Magnetic
HDG - Magnetic heading, deviation, variation
HDT - Heading, True
RMB - Recommended Minimum Navigation Information
RMC -Recommended Minimum Navigation Information
WPL - Waypoint Location
RTE - Routes
GGA - Global Positioning System Fix Data
GLL - Geographic Position, Latitude / Longitude
GSV - Satellites in view
VTG - Track Made Good and Ground Speed
VDM - Automatic Information System (AIS) position reports from other vessels
VDO - Automatic Information System (AIS) position reports from own vessel

Plus de renseignements à ce lien : http://opencpn.org/ocpn/nmea_sentences