P.S. After reading a bit more of Jane’s I found the following – which applies to units 208 and 675:
Quote:
Product Improved Vulcan Air Defence System (PIVADS)
General Dynamics Armament and Technical Products modified the fire-control system of the current Vulcan Air Defence System family and incorporated the ability to fire a new Mk 149 Armour Piercing Discarding Sabot (APDS) round, which increases the effective range of the system to 2,600 m. The fire-control improvements include replacing the disturbed line of sight currently used with a director sight to give a rate-aided tracking capability and linking a digital fire-control computer to the range-only radar for more accurate lead and superelevation commands to the cannon. The net result of the programme is to increase effectiveness while greatly simplifying the operation. The PIVADS programme is available in the form of modification kits for both the towed and self-propelled Vulcan air defence systems.
In September 1982, the US Army awarded the then Lockheed Electronics a contract for 285 kits for both the towed and self-propelled versions of the 20 mm Vulcan air defence systems, with first deliveries made in June 1984. These were installed on towed and self-propelled Vulcan air defence systems, with final deliveries in 1988.
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In other words, the effective AA range of the 20 mm M168 cannon was increased to 2,600 m.
Sorry about the double post.