Not all RF based systems are equal. GPS received signal strength at the Earths surface is around -130 dBm, barely above the thermal noise floor even in a good

Not all RF based systems are equal. GPS received signal strength at the Earths surface is around -130 dBm, barely above the thermal noise floor even in a good receiver. Around 1000km (most populated areas) from a Loran-C transmitter putting out 1000kW the signal strength is around -50 dBm. That is 9 orders of magnitude harder to jam. All bets are off if your opponent can wheel out 1000kW jammers.