Question

How many satellites does the GPRS receiver require to calculate only latitude and longitude? (a) One (b) Two (c) Three (d) Four

Answer 1

(d) Four. Normally, 2 satellites do the GPRS receiver requires to calculate only latitude and longitude.

Circle where two spheres around the satellites intersect and you could be at either of those two points.

 You are anywhere else along that circle and it could be airplane, underground, or spacecraft.

Fourth satellite determines the latitude, longitude, as well as elevation of your location.