On 12/22/2011 9:17 PM, Chris Adams wrote:
Once upon a time, Richard B. Gilbert<[email protected]> said:
The last time I heard, there were twenty-seven GPS satellites in
service.
There are currently 31 active.
There are usually anywhere from three to five or six above the
horizon at any given time.
It can be up to 8 or 9.
This kind of accuracy is far more than most people really need. It's
there if you need it even if you only need it for "bragging rights"!
The securities traders (especially HFT) want it. I suspect the OP is in
that group. That level of timekeeping has been discussed here before.
I think that the radio astronomers are some of the most demanding.
Joe Average just needs to get to the bus stop or railway station in time
to catch his chosen mode of transportation.
The securities traders generally need to time-stamp their transactions
within two seconds.
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