A mobile sensor platform that is capable of determining its precise location on the surface of Titan, one of Saturn's moons, or other extra-terrestrial area without a global positioning system (GPS) or orbiter has tremendous science value. This capability can allow the in-situ sensor platform to remain at or even return to a location of high scientific interest with great precision, as well as to determine the precise position science data is collected. We present an overview of in-situ navigation architectures utilizing various methods for performing fast, precise, in-situ location determination needed by an aerial vehicle acting as a mobile sensor platform on Titan without the use of an orbiter. Emphasis is placed on architectures that utilize potentially low-cost passive beacons. The fine resolution navigation or in-situ location determination may be used in conjunction with "course" navigation obtained via a long haul link to Earth. The "course" navigation allows the aerial vehicle to move between networks of beacons that are deployed at locations of high science interest.
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