Astronomy and Space News - Astro Watch: Pulsar-Based Spacecraft Navigation System One Step Closer to Reality
http://www.astrowatch.net/2016/08/pulsar-based-spacecraft-navigation.html
XNAV technology is currently in the early stages of development. In February 2017, NASA plans to launch the Neutron star Interior Composition Explorer (NICER)
to the International Space Station (ISS) that will be hosted as an externally attached payload on the orbital laboratory. An enhancement to the NICER mission,
the Station Explorer for X-ray Timing and Navigation Technology (SEXTANT) will perform the first space demonstration of pulsar-based navigation of spacecraft.
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