Thanks to Phil for the technical descriptions about GPS; I'd heard numbers like 1 foot for Differential accuracy. One minor correction to the "military buying civilian GPS gear" issues - a lot of it wasn't the military itself buying the gear, it was individual soldiers or their parents buying the sets so their kids wouldn't get lost out in the desert. I was at an AFCEA trade show, mainly looking for imaging and crypto stuff, but two of the biggest hits were the various GPS vendors and a vendor selling small drone airplanes. (Very few people probably needed the things for work, but they were Neat Stuff and you could understand what it did.) The 6-foot wingspan model had a payload of about 35 pounds; the 10-foot model had about 120 pounds, where payload includes fuel plus whatever else. The primary applications it was being marketed for were radio repeaters and video camera transmission systems, but the Army makes a backpack-carriable nuke that leaves you enough fuel-weight to get 1-200 miles.... Bill Stewart # Bill Stewart NCR Corp, 6870 Koll Center Parkway, Pleasanton CA, 94566 # Voice/Beeper 510-224-7043, Phone 510-484-6204 # email bill.stewart@pleasantonca.ncr.com billstewart@attmail.com