737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
Navigation Systems Description
11.20.2
MN-FLT-OH-201
Global Positioning System (GPS)
1B401, 1B801 - 1B806
Two GPS sensors in the Multi-Mode Receivers (MMRs) receive GPS satellite
signals. The left and right GPS sensors are independent and each provides an
accurate airplane geographical position to the FMC and other aircraft systems.
GPS operation is automatic.
GPS Displays
1B401, 1B801 - 1B806
POS REF page 2/3 shows the left and right GPS latitude and longitude position.
POS SHIFT page 3/3 shows the left and right GPS position relative to the FMC
position. NAV STATUS page 1/2 shows the GPS currently in use by the FMC for
position calculation.
GPS Data
The FMC selects a GPS position from one of the available GPS sources as the
primary update to the FMC position. When GPS position data is available, radio
updating can also occur. If all GPS data becomes unavailable, the FMC position
will be determined by radio or inertial (IRS) updating.
GPS navigational information can be manually deselected on the NAV OPTIONS
page 2/2. No other controls are provided because the operation of the GPS is
completely automatic.
March 1, 2021
