On 4/19/2013 6:56 AM, Bob Axtell wrote: > This came up in a conversation related to solar tracking. Will the > military shut off > ALL of the GPS services, or just positioning, during a wartime footing? > > How about time/date services? > > --Bob > Another option is CDMA off of cell towers. You can receive the time/date=20 signal without a subscription as towers routinely broadcast tower ID, time, and date .=20 Another option for really remote areas is satellite, not GPS, but weather satellites. They=20 can be received using fairly cheap hardware as shown here: http://www.wxtoimg.com/ Another option is airports, most broadcast time signals and then there=20 are weather services like Noaa weather radio . Mark --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .