The theoretical minimum number of satellites you need to be in contact with in order for a GPS receiver to know your position on the Earth is ____.
A) 1
B) 2
C) 3
D) 4
E) 5

Question

Quizplus · Accepted Answer

A GPS receiver needs to be in contact with at least three satellites in order to determine a 2D position (latitude and longitude). Four satellites are necessary to determine a 3D position (latitude, longitude, and altitude). However, four satellites are not always available or in range, so a GPS receiver can still operate with a minimum of three satellites.

The Theoretical Minimum Number of Satellites You Need to Be