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I'd imagine there's options if every space based constellation was knocked out. Ground based GPS transmitters are a thing (https://en.wikipedia.org/wiki/Pseudol

I'd imagine there's options if every space based constellation was knocked out. Ground based GPS transmitters are a thing (https://en.wikipedia.org/wiki/Pseudolite https://en.wikipedia.org/wiki/Pseudolite) and I'd imagine could be very quickly erected. And DARPA is putting significant money into GPS denied navigation systems as well: https://www.darpa.mil/news-events/2014-07-24 https://www.darpa.mil/news-events/2014-07-24 Assuming that modern semi conductor manufacturing wasn't knocked out at the same time, ship navigation would probably be fixed in a hurry.

throw0101b 3y ago
> […] ship navigation would probably be fixed in a hurry. Just make sure you have a sextant, an almanac, and a UTC-synced watch on-board and you're fine: * https://www.npr.org/2016/02/22/467210492/u-s-navy-brings-back-navigation-by-the-stars-for-officers https://www.npr.org/2016/02/22/467210492/u-s-navy-brings-bac... * https://www.popularmechanics.com/military/research/a36078957/celestial-navigation/ https://www.popularmechanics.com/military/research/a36078957...
- bookofjoe 3y ago
  Will UTC still be functioning?
- HeyLaughingBoy 3y ago
  If you're close enough to shore that a missing lighthouse would be an issue, a sextant wouldn't be very helpful (OK, you could use horizontal sextant angles, but those are not well known). An alidade and a compass will do just fine.