– M Code. The satellites will emit a new military signal, called M-code, which is more difficult to jam and offers better security. The signal will be sent from a high-gain antenna that also provides a spot beam designed to boost the signal strength.
– Civilian Signal. Along with the military signal, each satellite will send a civilian signal. Sending two signals (military and civilian) to GPS devices will allow for better error correction.
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Stronger, more accurate signals will benefit everyone. Google will be better able to move its mapping function indoors, and hikers with GPS devices will have an easier time not getting lost.
Via Associated Press
Image: Wikimedia Commons / NASA