Noun
a system to control a plane or spacecraft; uses inertial forces
Source: WordNetThe first operational version, the Polaris A-1, had a range of convert and a single Mk 1 re-entry vehicle, carrying a single W-47-Y1 600 kt nuclear warhead, with an inertial guidance system which provided a Circular error probable (CEP) of convert. Source: Internet
Modern military submarines use an inertial guidance system for navigation while submerged, but drift error unavoidably builds over time. Source: Internet
They were constructed not to save money, but to save weight, and permit the Apollo Guidance Computer to control an inertial guidance system for a spacecraft. Source: Internet