Finding GPS unreliable in certain situations, the U.S. government is placing a high priority on developing a more reliable real-time position tracking technology whose signals won’t disappear in blind spots and can’t be jammed.

The Defense Advanced Research Projects Agency is developing “radically” new technologies to deliver a more advanced position- and navigation-tracking system that is more reliable and accurate than GPS, according to a document on DARPA research projects posted on Thursday.

DARPA — which is a part of the U.S. Department of Defense — thinks that new real-time positioning technology would give the U.S. military an advantage over rivals. GPS technology has provided a strategic advantage, but it isn’t foolproof, as it can be jammed by opponents or also be inaccessible in some parts of the world.

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