British Aerospace/McDonnell Douglas Harrier GR.Mk5.
The British version of the AV-8B differs from the USMC aircraft in many details, and is designated Harrier GR.Mk5.
It features much British equipment including a Ferranti Inertial Navigation System and moving map display.
The Harrier GR.Mk5 has two 25mm Aden Cannon in underbelly pods, each with 100 round of ammunition. The AV-8B has only one cannon with the starboard pod housing 300 round of linkless ammunition.