Andreas,
You should still have a good view of many of the GPS constellation of
satellites at any time at your latitude. The GPS satellites are in fairly
high altitude orbits and have large footprints. A satellite at 55 degrees
would only be only a few degrees from directly overhead from you at 68N.
Terry
Not equatorial but also not polar... Inclination of 55° means that at
higher latitudes all the GPS satellites will be quite near to the
horizon. This also means there are fewer satellites visible at one time.
I agree that GPS might work if you are lucky and it might fail at more
fortunate latitudes anyway. But in general it will be more difficult to
get a GPS position the nearer to the poles you are. Actually our launch
site for high altitude rockets, near Kiruna in north Sweden, is located
at nearly 68° N, which is similar to Alaska or even north Antarctica
(speaking of absolute values).
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