Re: Can't use GPS on Alaska Airlines

Date:         18 Nov 96 10:11:14 
From:         Mark Crispin <mrc@CAC.Washington.EDU>
Organization: Networks & Distributed Computing
References:   1 2 3 4 5 6 7
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On 12 Oct 1996 rmeizlik@carroll.com wrote:
> One would hope that famous landmarks (Empire State building, WTC,
> Statue of Liberty, etc....) have their locations purposely fudged to avoid
> being targeted by terrorists using buzz-bomg/gps combos.

Anyone with a map can get the precise coordinates for these landmarks.

What's much more likely to happen in urban areas such as New York City is
to get multipath errors.  The combination of a cheap GPS receiver that can
not reject multipath, plus the difficulty of acquiring satellites in the
urban canyons, can easily produce big errors.

-- Mark --	Read http://www.imap.org for the "best kept secret in email"

DoD #0105, R90/6 pilot, FAX: (206) 685-4045  ICBM: N 47 39'35" W 122 18'39"
Science does not emerge from voting, party politics, or public debate.