anyone running GPS clocks in Southeastern Georgia?

Brandon Ross bross at
Sat Jan 22 06:10:49 CST 2011

On Fri, 21 Jan 2011, Gary E. Miller wrote:

> For non pilots, RAIM is an indicator that the GPS has a redundant
> solution that matches the barometrically measured altitude.

I know this is off topic, but I don't like to let incorrect information 
float around uncorrected.

RAIM never uses any data outside of GPS to confirm position, it is based 
entirely on more than the minimum number of satellites needed for a basic 
position to calculate redundant solutions, which means a minimum of 5 

If this were not the case, it would be impossible to get a RAIM 
"prediction" (using data about out of service sats) in advance of a 

Brandon Ross                                              AIM:  BrandonNRoss
                                                                ICQ:  2269442
                                    Skype:  brandonross  Yahoo:  BrandonNRoss

More information about the NANOG mailing list