those orbits have zero coverage at greater than 53 degrees latitude
That's not actually true -- the horizon distance at those altitudes is several thousand km, and one degree of latitude is about 100km, so the satellites are actually visible quite far to the north of there. Of course, they'll be increasingly far away and close to the horizon, so not optimal for reception.
That's not actually true -- the horizon distance at those altitudes is several thousand km, and one degree of latitude is about 100km, so the satellites are actually visible quite far to the north of there. Of course, they'll be increasingly far away and close to the horizon, so not optimal for reception.