MV-22 Navigation Exam Questions With
Complete Solutions
LWINS - ANSWER-Light Weight Inertial Navigation System - Total of 3 navigation sets
with interface to the GPS to provide navigation data to MCs and attitude data to FCCs
MAGR - ANSWER-Miniature Airborne GPS Receiver - Uses satellite and internal
computers to provide date, time, lat/long, altitude, velocity to INS and MCs
Kalman Filter - ANSWER-Mathematical program that blends GPS data with INS data to
provide accurate position
TACAN Range - ANSWER-Up to 390 nm
PARTIAL NAV READY advisory - ANSWER-A single INS has completed full alignment
NAV READY advisory - ANSWER-All 3 INSs have completed alignment
Figure of Merit (FOM) - ANSWER-Displayed in the upper left corner of the PFD, VSD,
and Hover Display. It represents the quality of the position data used for navigation. The
Lower the number the more accurate the position.
FOM 1 - ANSWER-Less than 26 meters position error
FOM 2 - ANSWER-26-50 meter position error
FOM 3 - ANSWER-51-75 meter position error
FOM 4 - ANSWER-76-100 meter position error
, FOM 5 - ANSWER-101-200 meter position error
FOM 6 - ANSWER-201-500 meter position error
FOM 7 - ANSWER-501-1,000 meter position error
FOM 8 - ANSWER-1,001-5,000 meter position error
FOM 9 - ANSWER-Greater than 5,000 meter position error
DEGRADED NAV READY advisory - ANSWER-At least one LWINS is in degraded NAV
mode meaning that less than full navigation mode but better than attitude mode.
POSITION DISAGREE Advisory - ANSWER-There is a difference in position of more
than 250 meters between any of the LWINS
GPS MONITOR FAULT Advisory - ANSWER-GPS horizontal or vertical limit has been
exceeded or it is unusable to detect and report an exceedence due to less than 5
satellite vehicles
GPS PERFORMANCE DEGR Advisory - ANSWER-GPS solution is degraded due to
poor satellite signal quality or it is not in sync with LWINS
Range to Display a JOG in CHART mode of the NAV Layer - ANSWER-10nm
(1:250,000 scale)
Range to Display a TPC in CHART mode of the NAV Layer - ANSWER-20nm
(1:500,000 scale)
Range to Display a ONC in CHART mode of the NAV Layer - ANSWER-40nm
(1:1,000,000 scale)
Complete Solutions
LWINS - ANSWER-Light Weight Inertial Navigation System - Total of 3 navigation sets
with interface to the GPS to provide navigation data to MCs and attitude data to FCCs
MAGR - ANSWER-Miniature Airborne GPS Receiver - Uses satellite and internal
computers to provide date, time, lat/long, altitude, velocity to INS and MCs
Kalman Filter - ANSWER-Mathematical program that blends GPS data with INS data to
provide accurate position
TACAN Range - ANSWER-Up to 390 nm
PARTIAL NAV READY advisory - ANSWER-A single INS has completed full alignment
NAV READY advisory - ANSWER-All 3 INSs have completed alignment
Figure of Merit (FOM) - ANSWER-Displayed in the upper left corner of the PFD, VSD,
and Hover Display. It represents the quality of the position data used for navigation. The
Lower the number the more accurate the position.
FOM 1 - ANSWER-Less than 26 meters position error
FOM 2 - ANSWER-26-50 meter position error
FOM 3 - ANSWER-51-75 meter position error
FOM 4 - ANSWER-76-100 meter position error
, FOM 5 - ANSWER-101-200 meter position error
FOM 6 - ANSWER-201-500 meter position error
FOM 7 - ANSWER-501-1,000 meter position error
FOM 8 - ANSWER-1,001-5,000 meter position error
FOM 9 - ANSWER-Greater than 5,000 meter position error
DEGRADED NAV READY advisory - ANSWER-At least one LWINS is in degraded NAV
mode meaning that less than full navigation mode but better than attitude mode.
POSITION DISAGREE Advisory - ANSWER-There is a difference in position of more
than 250 meters between any of the LWINS
GPS MONITOR FAULT Advisory - ANSWER-GPS horizontal or vertical limit has been
exceeded or it is unusable to detect and report an exceedence due to less than 5
satellite vehicles
GPS PERFORMANCE DEGR Advisory - ANSWER-GPS solution is degraded due to
poor satellite signal quality or it is not in sync with LWINS
Range to Display a JOG in CHART mode of the NAV Layer - ANSWER-10nm
(1:250,000 scale)
Range to Display a TPC in CHART mode of the NAV Layer - ANSWER-20nm
(1:500,000 scale)
Range to Display a ONC in CHART mode of the NAV Layer - ANSWER-40nm
(1:1,000,000 scale)
