How many satellites are required to accurately determine latitude and longitude?

How many satellites are required to accurately determine latitude and longitude?

• A. Two
• B. Three
• C. Four
• D. Five

Answer: (B)

To accurately determine latitude and longitude using GPS technology, three satellites are typically required. Each satellite provides information about its position and the time the signal was sent. By triangulating data from three satellites, a GPS receiver can calculate its position on the Earth's surface in two dimensions, allowing for the determination of latitude and longitude. However, to accurately calculate altitude as well, a fourth satellite is needed. This is why four satellites are often discussed in the context of providing a complete three-dimensional position fix. While three satellites can give you a two-dimensional fix (latitude and longitude), a full three-dimensional position that includes altitude requires four satellites. The choice indicating that three satellites are sufficient for determining latitude and longitude is thus correct due to this triangulation principle, focusing solely on the two-dimensional positioning aspect.

To accurately determine latitude and longitude using GPS technology, three satellites are typically required. Each satellite provides information about its position and the time the signal was sent. By triangulating data from three satellites, a GPS receiver can calculate its position on the Earth's surface in two dimensions, allowing for the determination of latitude and longitude.

However, to accurately calculate altitude as well, a fourth satellite is needed. This is why four satellites are often discussed in the context of providing a complete three-dimensional position fix. While three satellites can give you a two-dimensional fix (latitude and longitude), a full three-dimensional position that includes altitude requires four satellites.

The choice indicating that three satellites are sufficient for determining latitude and longitude is thus correct due to this triangulation principle, focusing solely on the two-dimensional positioning aspect.