grid reference box

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

grid reference system

military grid reference system (MGRS)

call for fire using `snail` grid reference

grid reference code

grid reference

grid zone / grid-zone

grid zone designation / Grid Zone Designator

JAN grid / Joint Army-Navy grid

guidance reference system

gyroscopic reference unit (GRU)

lay reference number

map reference

map reference code

NATO Master Cross Reference List (NMCRL) (logistics)

numbered reference position system

reference

reference diversion point

reference data

reference number (order / message / report)

stabilization reference package (SRP)

target reference point (TRP)

terms of reference (TOR)

World Geographic Reference System (WGRS); georef

Army doctrine reference publication (ADRP)

reference azimuth

fictitious reference point

real reference point

muzzle reference system (MRS)

principal currency / reference currency

inertial reference system

strapdown attitude heading reference system