GPS navigation wouldn't be the only disabled system doing so. One of the most used Cellular standard in the US is the CDMA standard. Even small misalignment of the GPS time can cause havoc in the CDMA communication network. So shutting down GPS would in fact mean sutting down all CDMA cellular networks.
In fact it might be the solution, you won't need the ambulance to go anywhere since peoples won't be able to call E911 center using what is now the most used telephone service, the cellular network...
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GPS navigation wouldn't be the only disabled system doing so. One of the most used Cellular standard in the US is the CDMA standard. Even small misalignment of the GPS time can cause havoc in the CDMA communication network. So shutting down GPS would in fact mean sutting down all CDMA cellular networks.
In fact it might be the solution, you won't need the ambulance to go anywhere since peoples won't be able to call E911 center using what is now the most used telephone service, the cellular network...