In order to display and transmit heading information on any Class A device, you would need more than just a GPS fix for your vessel. COG and SOG (Course over Ground and Speed Over Ground) can be determined by GPS alone, but in order to ascertain the true heading of a vessel (i.e the way it is pointing at any time) then you would need to use a dedicated True Heading Sensor or Gyro Compass that is capable of outputting an HDT or THS NMEA sentence containing this information.
If you connect a device that outputs a True Heading to the A100, then the heading will be displayed on your "Dynamic Data" screen of the unit and will also be transmitted as part of messages transmitted by the A100. GPS information alone (RMC sentences for example) is not sufficient to provide true heading information.
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