Elevation vs time for several satellites, 24 hours http://users.megapathdsl.net/~hmurray/time-nuts/Arctic/Elev-A.png Polar plot of the same satellites. http://users.megapathdsl.net/~hmurray/time-nuts/Arctic/Polar-A.png (see if I get this right) The satellites go around twice per day. Relative to the peak of the first orbit, the Earth (and receiver) has rotated 180 degrees so the second peak is over the pole. Elevation vs time for a single satellite http://users.megapathdsl.net/~hmurray/time-nuts/Arctic/Elev-07.png That shows how far the satellite orbit drifts over 4 days. Polar plot of all 31 active satellites, 24 hours http://users.megapathdsl.net/~hmurray/time-nuts/Arctic/Polar-all.png SVN 04 wasn't active. -- These are my opinions. I hate spam.