GPS Selective availability turned off

[Wookey]

On Tue 02 May, Robert Smallshire wrote:
> Good ol' Bill Clintons done the decent thing and turned off selective
> availability

Indeed. We (the BCRA CSG) were working on setting up a european DGPSip
station to supply differntial GPS info over the internet. This worked
usefully over a 3000mile baseline, and would be a useful adjunct to the
two US stations. All you need is a permanent net connection within 150
miles of a DGPS transmitter and about 400 quid-s worth of DGPS
receiver+transmitter.

This would have provided better GPS services for cavers anywhere in
europe (so long as they could get access to the net), however this change
may have made the idea largely redundant as non-SA GPS is probably good
enough for most cave-location purposes. I'm waiting to find out what the
expected differential numbers are under the non-SA regime, especailly
under long-baseline condiditions. Anyone here know?

Wookey
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