Ideas on a newer GPS in How do I...? Posted November 1, 2010 So then night time is not the greatest time I take it. The GPS works equally well at night as in the day. The satellites are not orbiting the Earth in a geo-synchronous orbit, so they will move across the sky. For best results, you want the satellites to be positioned all over the sky, not bunched up in one spot. The system works by estimating the distance from you to each satellite, and then computing the intersection of those lines. I'm not sure how to tell what the best time of day is. I just know that certain times will be better than other times because of the movement of the satellites. In my experience, the system will work best on days with no clouds in the sky, in places where there are no trees or buildings around.