Do gps car navigation devices emit signals that are harmful to human health?
No. Your gps unit just receives waves at a frequency a little above 1Ghz. The satellites are broadcasting this energy all of time, so you are blanketed with this energy regardless of whether you are using a gps receiver. The radiation from these satellites is low power at earth’s surface and should be harmless. Cell phones should be a much bigger concern for you because the cell phone sitting next to your brain contains a transmitter and receiver. The cell phone business is big business and determining the potential cell phone health hazard would depend on finding a neutral and objective test environment.
