Global positioning system (GPS) receiver being held in a hand. The system utilizes a network of satellites that orbit the Earth. Each of these sends out signals about its position and the time. By using the signals,the receiver can calculate its latitude,longitude & altitude,as well as the local time. Photographed in Greenland | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Fraser, Simon |
Taille de l’image : | 3030 px × 4610 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |