Quantcast GPS and INS theory and operating characteristics (Cont) - P-12820066

 

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T-45C TS INav-02
Introduction to INav and Voice Procedures
2.
The T-45C INS uses GPS present position latitude
and longitude, when performing initial position
alignment. If a valid GPS signal is not available, the
INS will use WYPT-0 position, but to make that
happen, the pilot has to do one of the following:
a.
Select the restart (RST) option on the aircraft
(ACFT) data page
NOTE: This is the simplest and most preferred
method.
b.
Select power (PWR) on the BIT page (either the
weight-on-wheels or weight-off-wheels pages)
c.
Change WYPT-0 latitude (LAT) or longitude
(LONG)
NOTE: Pilot should assure that WYPT-0
coordinates correctly correspond to the actual
aircraft position. If not, WYPT-0 LAT/LONG
should be updated.
3.
INS gyro systems are self-contained and not
susceptible to enemy jamming or remote signal loss
4.
The advent of laser gyros, which have replaced
earlier mechanical gyros, has vastly improved INS
5.
The T-45C INS normally operates in close
conjunction with the GPS: HYBD mode
6.
The T-45C INS can operate independently from the
GPS: INS mode
7.
INS alignments using the SHIP option on the aircraft
DATA page are designed for use aboard a moving
ship. GPS is required
(2-02) Original
Page 2-25


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