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? Can a second Cortex Handset listen to different channels? Can I program the MMSI number Cortex myself? How is NMEA 0183 data from Cortex (NMEA 2000 translation into NMEA 0183) get transmitted?