RELNAVRelative Navigation
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The SOSC currently supports testing of Orion's Relative Navigation System, which includes Sensor Test for Orion RelNav Risk Mitigation or STORRM - a navigation and docking system that will be tested on the upcoming STS-134 shuttle mission to the International Space Station.
Similarly, the Link-16 tactical data link has a "relative navigation" (RELNAV) that improves navigation resolution in a GPS-denied environment, potentially at accuracies that equal or exceed that of the current GPS system.