great circle heading

great circle course

great circle distance

great circle route

primary great circle spherical coordinate system

great-circle range

attitude-and-heading reference system / attitude and heading reference system (AHRS)

declination aiming circle (declinated aiming circle)

great powers

brief on great intel

great armored battle

great intel

stand a great amount of punishment

aircraft heading

compass heading

attack heading

case-heading operation

strapdown attitude heading reference system

heading programmer

landing heading

runway heading

attitude-and-heading reference system (AHRS)

reciprocal heading

reciprocal heading index

true heading (TH)

heading and attitude reference system

replacement attitude and heading reference system

grid heading

gyromagnetic heading

heading alignment

heading clearance

heading selector

interception of runway heading