The internal clock in a cheap handheld GPS can be hideously inaccurate because knowing the time within a few minutes of correct (and the location within a few thousand miles) is ample to quickly determine which satellites should be in view.
Consider for a moment what happens if you have a (lossless) very long antenna lead between the antenna and the GPS. Let's say the antenna is 10 kilometres from the GPS and the antenna cable is straight.
- What position does the GPS report?
- What time does the GPS report?
Descriptions will do, no need to do the maths for the second question.