[GPSNavX]

This means if the NMEA stream (i.e. from a GPS) includes, the $GPRTE and $GPBOD sentences AND "Enable Waypoints" is checked in the TCP/IP setup, iNavX will import and navigate to the active route.

Covered in the iNavX help ..

http://www.gpsnavx.com/iNavX/help/instruments.htm

Screen shot ..

http://www.inavx.com/images/screenshots/...troute.png