six o'clock aiming point

six- o'clock holding

declination aiming circle (declinated aiming circle)

aiming dot; aiming mark; crosshair; crosswires; pointing mark; telescope laying mark

aiming lamp / aiming light

aiming post lamp / aiming post light

six-digit grid

watch your six

cross-country six-wheeler

six-wheeler

six-component balance

Ordnance Quick Firing 6-pounder / QF6-pounder / six-pounder

six-figure reference

six-shooter

Aiming point-director

auxiliary aiming mark (point)

bearing to aiming point

aiming point marking

aiming point of landing

aiming point

aiming point offset

assumed aiming point

gun aiming point

gun-aiming point 1

gun-aiming point 2

clock delay mechanism

slave clock

around-the-clock fire support

clock code

clock course

clock-course angle

user clock time bias error

round the clock operation aerodrome