On 7/10/15 6:23 AM, Azelio Boriani wrote: >>From <http://www.gps.gov/systems/gps/space/> > Block IIA: 3 operational > Block IIR and IIR(M): 19 operational > Block IIF: 9 operational > so they should be 31 satellites working. > Plus various and sundry WAAS and similar signals?