>FYI the 24 GPS satellites are all in Low Earth Orbit. No, they're not. LEO is an orbital period of 128 minutes or less, which for circular orbits is ~1200 mi

>FYI the 24 GPS satellites are all in Low Earth Orbit. No, they're not. LEO is an orbital period of 128 minutes or less, which for circular orbits is ~1200 miles or less [1]. GPS satellites are in 12 hour orbits ( see "Orbital Characteristics" in [1], putting them at a little more than 12,500 miles out [2]. And anyway, a satellite's altitude has little to do with how soft a target it might be. It's not simple. That said, I'm glad training emphasizes non-GPS modalities. You never can tell when Carrington will come calling [3]. [1] https://en.wikipedia.org/wiki/Low_Earth_orbit https://en.wikipedia.org/wiki/Low_Earth_orbit [2] https://en.wikipedia.org/wiki/Global_Positioning_System https://en.wikipedia.org/wiki/Global_Positioning_System [3] https://en.wikipedia.org/wiki/Solar_storm_of_1859 https://en.wikipedia.org/wiki/Solar_storm_of_1859