British National Grid Reference
military grid reference system
apparatus grid grid system
inertial [reference] frame， inertial [reference] system
optical reference filter wavelength standard reference material
Hong Kong 1980 Grid， HK 1980 Grid
Universal Transverse Mercator Grid [UTM Grid]
Universal Transverse Mercator Grid， UTM Grid
(thermo) reference material
137Cs reference inventory
3D forward looking reference map