Final answer:
You can use GPS to determine your position at any time during your flight, even if you are unsure of your location.
Step-by-step explanation:
At any time during your flight, if you are unsure of your location, you can use GPS to determine your position. GPS relies on an array of 24 satellites orbiting the Earth, and at least 4 of them are visible from any spot on Earth. Each satellite carries a precise atomic clock. Your GPS receiver detects the signals from those satellites that are overhead and calculates your position based on the time that it has taken those signals to reach you. By comparing the time the signals were sent with the time they were received, the GPS receiver can calculate your distance from each satellite and triangulate your position. This allows you to accurately determine your location even if you are unsure during your flight.