Vulcan B.2s were eventually fitted with the free-running dual-gyroscopic heading reference system (HRS) Mk.2, based upon the inertial platform of the Blue Steel missile, which had been integrated into the system when the missile had been carried. With the HRS a navigator's heading unit was provided, which enabled the navigator plotter to adjust the aircraft heading, through the autopilot, by as little as 0.1 degrees. The B.2 (MRR) was additionally fitted with the LORAN C navigation system.
vulcan b2s were eventually fitted with the free-running dual-gyroscopic heading reference system (hrs) mk2 based upon the inertial platform of the blue steel missile which had been integrated into the system when the missile had been carried with the hrs a navigator's heading unit was provided which enabled the navigator plotter to adjust the aircraft heading through the autopilot by as little as 01 degrees the b2 (mrr) was additionally fitted with the loran c navigation system