When I'm at home I will turn on my compass and it will say it's pointing North when it's really pointing South...but when I come to work it'll be normal again. Is this happening to anyone else I wonder??? Is this due to a faulty thingamajig or would it be caused from the Rogers cell tower?? Or is it a possible mixture or the new antennas in the 4S and the Rogers tower are not working properly?? Hard to say as it works else where, just not at home. EDIT>>> Yup can't be a faulty GPS chip as my compass is bang on here at work and when in the maps app, after pressing the blue arrow to see what direction I'm facing that works great too...and it shows me exactly where I am on the map.