A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Steve Dunlop
Date: 2018 Sep 25, 15:15 -0700
Thanks for the insightful reply.
That would leave us with the only debris-related problem being due to a collision taking place near 20,200 km. I don't believe there's any plausible way that could occur other than as the result of hostile action.
I do understand that a partial constellation is still useful. In fact, I used GPS receivers long enough ago that the full constellation was not yet deployed, and yes, we would get fixes of varying quality, all better than a CN fix. Ocean navigation has an advantage here in that, unlike land-based navigation, there is not a problem with reception of some satellites being blocked by terrain, vegetation, or buildings.