Introduction

GPS observations are based on the basic principle of trilateration. Trilateration, which literally means positioning from three distances. A global positioning system (GPS) device uses data from satellites to locate a specific point on the Earth in a process called trilateration. To trilaterate, a GPS receiver measures the distances to satellites using radio signals.
This experiment is useful to study of GPS and its accessories.

Principle

GPS observations are based on the basic principle of trilateration.

Equipments Used

1. Receiver.
   
2. Controller (display and commands).
   
3. Battery for power supply.
   
4. Tripod or stand.