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enters the NAV mode.
· Navigation (NAV) Mode − The GNSSU enters the NAV mode when it has computed a
navigation solution that provides position, velocity, and time measurements. The GNSSU
sends GPS position data to the FMS. From the NAV mode the GNSSU enters the acquisition
mode or aided mode.
· Aided Mode − The GNSSU enters the aided mode when there is insufficient satellite and/or
altitude information, but externalaided
data (inertial velocities from the FMS) is available to
continue to update the NAV filter. While in this mode, the GNSSU provides valid time outputs.
From this mode, the GNSSU enters the NAV or acquisition mode.
· Altitude Aiding Mode − The GNSSU enters the altitude aiding mode if satellite measurements
(less than 4) are not sufficient to maintain integrity or remain in the NAV mode. This mode uses
altitude data from the ADC to aid the navigation solution and integrity monitoring during
extended periods of insufficient satellite coverage and geometry. When the calibrated pressure
altitude deviation estimate is out of limits, it reverts to the aided mode. From this mode, the
GNSSU enters the NAV or aided modes.
· Fault Mode − The GNSSU enters the fault mode when any faults in the GNSSU is detected.
This mode supersedes all other modes. Any faults will be reported on the FMS CDU. The FMS
MSG indicator MSG will illuminate and GPS 1 (2) FAILED message will appear in the FMS
scratchpad.
GPS 1 FAILED
The control stations that continuously track and monitor the satellites, are located in Ascension
Island, Diego Garcia, Hawaii, Kawajalein Island and Colorado Springs. GPS has an accuracy of 100
meters in 95% of the position fixes.
NAVIGATION
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
17−10−81
MODES OF OPERATION: (CONT'D)
GPS Access
To access the GPS on the FMS CDU, proceed as follows:
GF1710_176
NAV INDEX 1/2
FPL LIST FPL SEL
WPT LIST DATA BASE
DEPARTURE ARRIVAL
POS SENSORS TUNE
NAV INDEX 1/2
FPL LIST FPL SEL
WPT LIST DATA BASE
DEPARTURE ARRIVAL
POS SENSORS TUNE
POS SENSORS 1/2
FMS POS UPDATE
IRS 1 STATUS
IRS 2 STATUS
VOR / DME POSIT INIT
N33 ° 26 . 6 W112 ° 12 . 1
N33 ° 26 . 6 W112 ° 12 . 1
N33 ° 26 . 6 W112 ° 12 . 1
POS SENSORS 1/2
FMS POS UPDATE
IRS 1 STATUS
IRS 2 STATUS
VOR / DME POSIT INIT
N33 ° 26 . 6 W112 ° 12 . 1
N33 ° 26 . 6 W112 ° 12 . 1
N33 ° 26 . 6 W112 ° 12 . 1
POS SENSORS 2/2
FMS POS UPDATE
GPS STATUS
VOR / DME POSIT INIT
N33 ° 26 . 6 W112 ° 12 . 1
N34 ° 02 . 6 W112 ° 02 . 3
GPS Status
GPS STATUS 1/2 displays the following information:
· GPS position
· Groundspeed
· Altitude
· Miles from FMS position
NAVIGATION
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
17−10−82
MODES OF OPERATION: (CONT'D)
GPS Status (Cont’d)
To view the GPS STATUS 1/2 on the FMS CDU, proceed as follows:
GF1710_177
1 Press STATUS key.
POS SENSORS 2/2
FMS POS UPDATE
GPS STATUS
VOR / DME POSIT INIT
N33 ° 26 . 6 W112 ° 12 . 1
N34 ° 02 . 6 W112 ° 02 . 3
GPS 1 STATUS 1/2
GPS POSITION
GRD SPD = 310 GPS ALT
MILES FR FMS POS
POS SENSORS PRED RAIM
N34 ° 02 . 6 W112 ° 02 . 3
N302 KT E68 KT 14999
NO . 1 W 4 . 4 TOTAL 4 . 4
GPS STATUS 2/2 displays the following information:
· Receiver Autonomous Integrity Monitor (RAIM).
· Figure of Merit (FOM).
· Horizontal Dilution of Precision (HDOP).
· Vertical Dilution of Precision (VDOP).
· Time (UTC) and Date.
· Operating Mode.
· Satellites Tracked.
RAIM and FOM indicate current uncertainty of position expressed in nautical miles. HDOP and
VDOP are numbers that rate current satellite geometry in the horizontal and vertical axis with 1
being the best geometry. Normally HDOP and VDOP numbers are below 10.
To view the GPS STATUS 2/2 on the FMS CDU, proceed as follows:
GF1710_178
1 Press NEXT function key.
NOTE
For more information, refer to the Flight Management System Pilot’s Guide.
GPS 1 STATUS 1/2
GPS POSITION
GRD SPD = 310 GPS ALT
MILES FR FMS POS
POS SENSORS PRED RAIM
N34 ° 02 . 6 W112 ° 02 . 3
N302 KT E68 KT 14999
NO . 1 W 4 . 4 TOTAL 4 . 4
GPS 1 STATUS 2/2
　
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