Use of the ski jump allowed the aircraft to take off from a short flight deck with a heavier loadout than otherwise possible, although it can also take off like a conventional loaded fighter without thrust vectoring from a normal airport runway. The Sea Harrier was largely based on the Harrier GR3, but was modified to have a raised cockpit with a "bubble" canopy for greater visibility, and an extended forward fuselage to accommodate the Ferranti Blue Fox radar. Parts were changed to use corrosion resistant alloys or coatings were added to protect against the marine environment. After the Falklands War, the Sea Harrier was fitted with the new anti-ship Sea Eagle missile. The Sea Harrier FA2 featured the Blue Vixen radar, which was described as one of the most advanced pulse doppler radar systems in the world; the Blue Fox radar was seen by some critics as having comparatively low performance for what was available at the time of procurement. The Blue Vixen formed the basis for development of the Eurofighter Typhoon's CAPTOR radar. The Sea Harrier FA2 also carried the AIM-120 AMRAAM missile, the first UK aircraft to be provided with this capability. An upgraded model of the Pegasus engine, the Pegasus Mk 106, was used in the Sea Harrier FA2; in response to the threat of radar-based anti aircraft weapons electronic countermeasures were added. Other improvements included an increase to the air-to-air weapons load, look-down radar, increased range, and improved cockpit displays. The cockpit in the Sea Harrier includes a conventional centre stick arrangement and left-hand throttle. In addition to normal flight controls, the Harrier has a lever for controlling the direction of the four vectorable nozzles. The nozzles point rearward with the lever in the forward position for horizontal flight. With the lever back, the nozzles point downward for vertical takeoff or landing. The usefulness of the vertical landing capability of the Sea Harrier was demonstrated in an incident on 6 June 1983, when Sub Lieutenant Ian Watson lost contact with the aircraft carrier and had to land Sea Harrier ZA176 on the foredeck of the Spanish cargo ship "Alraigo". In 1998, the UK Defence Evaluation and Research Agency test-fitted an FA2 with AVPRO UK Ltd's Exint pods, small underwing compartments intended to be used for deployment of special forces. In 2005, although already timetabled to be retired, a Sea Harrier was modified with an 'Autoland' system to allow the fighter to perform a safe vertical landing without any pilot interaction.