not good at all... but does the "military GPS" have this problem?. if not, theN "license" Emergency services to use the "military" GPS... PROBLEM solved... off course if the military does not want to this ... WERE ALL DOOMED, I SAY, WERE ALL DOOMED. LOL... and SOL.
but any sane person does not trust GPS 100% of the time.
(look outside and at your surrounding people!)
and use the internet to get maps... (second source helps)
(but this could be a feature, the white house (or government builds) would be protected by having this kind of "jammer" to Deactivate any gps's...