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From: nickw@syma.sussex.ac.uk (Nick Watkins)
Newsgroups: sci.space.shuttle
Subject: Re: Endeavour & GPS
Message-ID: <5005@syma.sussex.ac.uk>
Date: 2 May 91 09:44:29 GMT
References: <1991May1.162616.16919@zoo.toronto.edu>
Organization: University of Sussex
Lines: 12

From article <1991May1.162616.16919@zoo.toronto.edu>, by henry@zoo.toronto.edu (Henry Spencer):
>>1) Why didn't previous shuttles carry it ?
> 
> The existing shuttle orbiters are all nearly ten years old, and the design
> is even older.  Navstar, aka GPS, has become semi-operational only quite
> recently.
True, but Navstar itself dates back at least to mid 70s in design (I had
descriptions of it from USAF in late 70s), and it was expected to become
operational rather earlier than now, was it not ? 

Nick
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