Position Reference
On position reference page 4, the calculated positions and ground speeds from the left, centre and right IRS are displayed. Positions can be displayed in the bearing/distance or latitude/longitude format.
IRS L - Displays the position of the Left IRS. Positions can be displayed in latitude longitude or as bearing and distances from the FMC position.
IRS C - Displays the position of the Centre IRS. Positions can be displayed in latitude longitude or as bearing and distances from the FMC position.
IRS R - Displays the position of the Right IRS. Positions can be displayed in latitude longitude or as bearing and distances from the FMC position.
INDEX - Displays the INIT/REF INDEX page.
GS - Displays the ground speed calculated by the IRS. The displayed values are frozen when the engines are shut down after flight until power is removed.
GS - Displays the ground speed calculated by the IRS. The displayed values are frozen when the engines are shut down after flight until power is removed.
GS - Displays the ground speed calculated by the IRS. The displayed values are frozen when the engines are shut down after flight until power is removed.
BRG/DIST - Alternately changes the displayed position between latitude/longitude format and bearing/distance format. When the display is in the bearing/distance format the prompt displays LAT/LON>.