Anthony @ Equity Investigations, Dear Anthony, Message Board

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Strategies & Market Trends : Anthony @ Equity Investigations, Dear Anthony,

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To: Jetter who wrote (16343)	3/3/1999 12:32:00 AM
From: Don Westermeyer	Read Replies (1) of 122087

A GPS failure would not significantly effect air traffic, if at all. No commercial aircraft is certified to fly with GPS as the only navigation system (to the best of my knowledge - I do work in the field though). In fact a large percentage of aircraft in service don't even have a GPS receiver installed in the aircraft. GPS is only really needed under a couple of conditions. The first is the GPS is sometimes relied upon in long range navigation (like over the ocean) instead of a more expensive inertial navigation system. Very few (if any) aircraft used for long flights are configured like this though. The biggest thing GPS is really used for is for certain 'GPS overlay' type approaches. The worst thing that could happen is these approaches might be unavailable. This is no big deal because there are plenty of other kinds of approaches to use. In fact the GPS overlay type approaches have just come on line recently anyway. I know the Y2K shills on the Tava thread, etc. think planes will just fall out of the sky because of this, but it just won't happen. I'd be much more worried about ATC than anything GPS related. FWIW I have heard of a few brands low cost commercial GPS receivers that probably do have a Y2K problem (the roll-over problem is in the receiver, not the satellite). The biggest fear that I have is that the FAA would "fall back" on the distance/spacing regulations governing arrivals and departures in and out of most of the busier airports. Several years ago, under protest the FAA controllers began issuing the regulatory spacing requirements and it nearly shut down the air traffic system.

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