Nanohertz Gravitational Waves and Space-based Navigation using Pulsars

The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) uses a collection of rotating neutron stars, a "Pulsar Timing Array", as a nanohertz gravitational wave detector. The Neutron Star Interior Composition Explorer (NICER) is an x-ray telescope on the International Space Station dedicated to neutron star observations. I will talk about how we combine the two missions to maximize our understanding of (a) the nanohertz gravitational wave universe, (b) the merging history of supermassive black holes, and (c) the intrinsic stability and emission mechanism of pulsars themselves. At the same time we provide a new method for space-based navigation using pulsars. (Talk given on behalf of NANOGrav, NICER, and SEXTANT teams.)