The latter. Very few people need precise geolocation on Mars or any other non-Earth planet. But planets are not perfect spheres (mainly due to rotation), so tre

The latter. Very few people need precise geolocation on Mars or any other non-Earth planet. But planets are not perfect spheres (mainly due to rotation), so treating them as such introduces errors. If you're curious about the topic, you can start here: https://en.wikipedia.org/wiki/World_Geodetic_System https://en.wikipedia.org/wiki/World_Geodetic_System.