Can Cortex be equipped with earphones or headset? Follow No, earphones or headsets are not currently supported by the Cortex Handsets. Related articles Can I use the heading sensor data from Cortex across my network? Will the Cortex Onboard app have VHF listening? How is NMEA 0183 data from Cortex (NMEA 2000 translation into NMEA 0183) get transmitted? Can a second Cortex Handset listen to different channels? Can I program the MMSI number Cortex myself?