The US government flicked the switch today on a new GPS signal, known as L2C. The signal, according to the government, is transmitted at a higher effective power, allowing it to "work better in urban areas and indoors." The new signal, being transmitted by the IIR satellite launched in September, can also be received using less power, potentially allowing better GPS reception by smaller devices such as cellphones. However, most current devices may not be able to make use of the new signals without upgrades.
Government turns up volume on GPS
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