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31st January 2006 | 06:41

#12 (permalink)

GlueBall

Joined: Jun 2001

Posts: 2,627

Likes: 2

From: UTC +8

Most logically, UAVs operate at +500' altitude levels, just in case of accidental airways infringements. Its military transponders are "stealth" and preclude interaction with civilian TCAS mode. Selective radar tracking by military controllers.