Hello. Does GPS cover the entire planet? All land and oceans? Thanks.
Yes it is possible to find your location using GPS anywhere on the earth's surface, however the GPS satellites are never directly overhead at the North and South poles (see picture), so althought it is possible to use GPS at the poles the positioning won't be as accurate
Pretty much. They were designed that way. However, to pick up accurate location data, you need at least 3-4 satellites in your vicinity.
