From Lexicanum

There were three Armageddon Monitoring Stations, each named after a hero of the Second War for Armageddon. They were named Yarrick, Dante and Mannaheim, but unfortunately they were all destroyed in the early stages of the Third War for Armageddon; Dante first, then Yarrick and Mannaheim at the same time. They did, however, give advanced warning of the arrival of the Ork fleets.

They were the most advanced monitoring stations ever produced and were put in orbit beyond the furthest planet to give maximum scanning range. They replaced the out-dated monitoring satellites maintained by Herman von Strab, which were almost useless as Von Strab ignored the information coming from them.

Sources

• Armageddon History (accessed 2007-04-10)