> The US military is working on a device that can use stars to determine location even during the day. They already developed a device that could do that in th

> The US military is working on a device that can use stars to determine location even during the day. They already developed a device that could do that in the 60s, but it was quite large: https://en.wikipedia.org/wiki/Lockheed_SR-71_Blackbird#Astro-inertial_navigation_system https://en.wikipedia.org/wiki/Lockheed_SR-71_Blackbird#Astro... https://timeandnavigation.si.edu/multimedia-asset/nortronics-nas-14v2-astroinertial-navigation-system https://timeandnavigation.si.edu/multimedia-asset/nortronics... Do you have a source for the one you say they're working on? Is more portable or hand-held?