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> Military solutions will fall back to inertial, celestial or optical guidance, and people using GPS for navigation will at worst show up where they need to be

> Military solutions will fall back to inertial, celestial or optical guidance, and people using GPS for navigation will at worst show up where they need to be somewhat later than planned. The US Navy re-started celestial navigation a few years ago: * 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... This (1960s?) US government produced (45m) video video gives a pretty good overview: * https://www.youtube.com/watch?v=UV1V9-nnaAs https://www.youtube.com/watch?v=UV1V9-nnaAs For those wanting to invest (substantially) more time, the two videos by "Tippecanoe Boats" are slightly rambling at times, but he does lay things out pretty well by the end of it (second is largely examples): * https://www.youtube.com/watch?v=-ARXW8InStY https://www.youtube.com/watch?v=-ARXW8InStY * https://www.youtube.com/watch?v=yu5R5mrrGB0 https://www.youtube.com/watch?v=yu5R5mrrGB0

PaulHoule 6y ago
This kind of weapon has a backup INS https://en.wikipedia.org/wiki/Joint_Direct_Attack_Munition https://en.wikipedia.org/wiki/Joint_Direct_Attack_Munition The INS doesn't need to be terribly high performance because it only needs to work for the time it takes a bomb to fall from the sky.
ardy42 6y ago
>> Military solutions will fall back to inertial, celestial or optical guidance, and people using GPS for navigation will at worst show up where they need to be somewhat later than planned. > The US Navy re-started celestial navigation a few years ago: Also, the SR-71, B-1, and B-2 and other aircraft have automated celestial navigation systems to provide corrections to their INSs: https://www.thedrive.com/the-war-zone/17207/sr-71s-r2-d2-could-be-the-key-to-winning-future-fights-in-gps-denied-environments https://www.thedrive.com/the-war-zone/17207/sr-71s-r2-d2-cou... Honestly, for military applications, GPS seems to be mainly useful for bad weather and providing navigation to the smallest units (and I'd think a small unit would be able fall back to a map and compass).
- mycall 6y ago
  ICBMs also use celestial navigation systems for same reasons.
matheusmoreira 6y ago
These military instructional videos are so great. They explain a lot of concepts very clearly. Nowadays videos seem to be more casual, with more focus on practice than understanding the theory.

PaulHoule 6y ago

This kind of weapon has a backup INS https://en.wikipedia.org/wiki/Joint_Direct_Attack_Munition https://en.wikipedia.org/wiki/Joint_Direct_Attack_Munition The INS doesn't need to be terribly high performance because it only needs to work for the time it takes a bomb to fall from the sky.

ardy42 6y ago

>> Military solutions will fall back to inertial, celestial or optical guidance, and people using GPS for navigation will at worst show up where they need to be somewhat later than planned. > The US Navy re-started celestial navigation a few years ago: Also, the SR-71, B-1, and B-2 and other aircraft have automated celestial navigation systems to provide corrections to their INSs: https://www.thedrive.com/the-war-zone/17207/sr-71s-r2-d2-could-be-the-key-to-winning-future-fights-in-gps-denied-environments https://www.thedrive.com/the-war-zone/17207/sr-71s-r2-d2-cou... Honestly, for military applications, GPS seems to be mainly useful for bad weather and providing navigation to the smallest units (and I'd think a small unit would be able fall back to a map and compass).

mycall 6y ago
ICBMs also use celestial navigation systems for same reasons.

matheusmoreira 6y ago

These military instructional videos are so great. They explain a lot of concepts very clearly. Nowadays videos seem to be more casual, with more focus on practice than understanding the theory.