Global navigation satellite systems enable receivers to determine their location using time signals transmitted along a line of sight by radio from satellites.

• A. Direction, time
• B. Location, time
• C. Location, hand
• D. Direction, hand

Answer: (B)

GNSS relies on timing to determine position. Satellites broadcast highly precise time stamps, and the receiver measures how long each signal takes to arrive. By converting that travel time to distance (using the speed of light) to several satellites, the receiver solves for its three spatial coordinates plus its own clock error. With four or more satellites, you can determine both where you are and the exact time according to the system. That’s why location and time is the best pairing. Direction isn’t directly obtained from these time signals alone, and a non-technical term like “hand” doesn’t apply here.