So if a blip is a blip and the transponder was most likely switched off, would enroute ATC been given the heads up as to who they were really = dealing with in order to maintain separation, etc? Mark -----Original Message----- From: The Airline List [mailto:AIRLINE@xxxxxxxxxxxxxxxxx] On Behalf Of = RWM Sent: Friday, December 05, 2003 5:36 PM To: AIRLINE@xxxxxxxxxxxxxxxxx Subject: Re: Radar Correct, a blip is a blip, but no one is operating with primary radar = unless the more sophisticated secondary systems fail. When using the secondary systems, which is hopefully 100.0% of the time, they are looking at = flight data tags, essentially "Post It Notes" attached to the primary returns, whose data issues from flight plan data (and manually input for pop-up traffic). Separation standards are driven by the secondary system, = using relationships between tagged traffic. - RWM (7N3) -- - R.W. Mann & Company, Inc. >> Airline Industry Analysis Port Washington, NY 11050 >> tel 516-944-0900, fax -7280 mailto:RWM@xxxxxxxxxx >> URL http://www.RWMann.com/ Floridasky@xxxxxxx wrote: > > A radar blip looks exactly the same for 747 and single engine Cessna.=20 > Believe or not flock of migrating geese will appear like an aircraft.=20 > In South Florida controllers call possibel traffic for semi trucks on=20 > I 595 on occasion not know for sure what it is. You can observe ships=20 > just off the coast on radar at times also. They all look an aircarft=20 > hit. > > Mike (MIA) --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.542 / Virus Database: 336 - Release Date: 18/11/2003 =20 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.542 / Virus Database: 336 - Release Date: 18/11/2003 =20