GPS and INS theory and operating characteristics (Cont)

T-45C TS INav-02

Introduction to INav and Voice Procedures

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:

Select the restart (RST) option on the aircraft

(ACFT) data page

NOTE: This is the simplest and most preferred

method.

Select power (PWR) on the BIT page (either the

weight-on-wheels or weight-off-wheels pages)

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.

INS gyro systems are self-contained and not

susceptible to enemy jamming or remote signal loss

The advent of laser gyros, which have replaced

earlier mechanical gyros, has vastly improved INS

The T-45C INS normally operates in close

conjunction with the GPS: HYBD mode

The T-45C INS can operate independently from the

GPS: INS mode

INS alignments using the SHIP option on the aircraft

DATA page are designed for use aboard a moving

ship. GPS is required

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