A method and system displays information in a full face mask. A display module is mounted inside the full face mask on faceplate support structure outside of a forward viewing area of a faceplate portion. The display module is located to be free of interference with an operator's forward field of view through the forward viewing area. A display control module is externally mounted on outside components of the full face mask and has a waterproof housing, processing and display driving electronics, memory, internal sensors, external sensors, and battery. A power-data cable is connected to the display control module externally mounted on the full face mask and to the display module inside the full face mask via an accessory interface plate. A switch on the display control module can be accessed and selectably actuated by an operator to present data from the display control module on the display module.