UAG Navigation and GPS Systems

Question 1

What minimum number of GPS satellites must a receiver have line-of-sight to in order to calculate a three-dimensional position fix?

Accepted Answer

4 satellites

Answer

A GPS receiver needs signals from at least 4 satellites to calculate latitude, longitude, altitude, and time simultaneously for a 3D position fix.

Question 2

What does WAAS stand for in the context of GPS navigation?

Accepted Answer

Wide Area Augmentation System

Answer

WAAS (Wide Area Augmentation System) is an FAA satellite-based augmentation system that improves GPS accuracy for aviation use to approximately 1–3 meters.

Question 3

Which FAA publication would a remote pilot check to learn about scheduled GPS signal outages or testing in a specific area?

Accepted Answer

NOTAMs (Notices to Air Missions)

Answer

NOTAMs (Notices to Air Missions) are used to inform pilots, including remote pilots, of GPS anomalies, outages, and testing affecting navigation.

Question 4

Magnetic variation (declination) is best defined as:

Accepted Answer

The angular difference between true north and magnetic north at a given location

Answer

Magnetic variation is the angular difference between true geographic north and magnetic north, which varies by location and changes slowly over time.

Question 5

What is Receiver Autonomous Integrity Monitoring (RAIM)?

Accepted Answer

A GPS feature that allows receivers to detect faulty satellite signals

Answer

RAIM is a GPS receiver function that cross-checks multiple satellite signals to detect and exclude faulty signals, providing integrity monitoring without external input.

UAG - Unmanned Aircraft General Practice Test

UAG - Unmanned Aircraft General Practice Test

UAG Navigation and GPS Systems