Earth has GPS, GNSS and more I guess. Will there (eventually) be a Navigation system for our Solar system so that autonomous (and manned) flights can move around like we do in our vehicles with an onscreen map. Not trying to be fanciful here just wondered if there are discussions or papers. I assume any trip to Mars say would have a system onboard in case of emergencies like lost Earth contact. And not trying to get to the Stars but I guess that is a different e.g. pulsar method when having left the Solar system behind but only mentioned it as any Solar Positioning System (SPS) might signal for that purpose as the 'Home' coordinate. Also wondered if existing Spacecraft orbiting planetary bodies by default act as reference points. Did iSearch but not anything really obvious there. Thanks.