i do some experiment place two sensor node between them 4 meter as distance.
then i get these GPS information:
Latitude: 32, 33.255 , Longitude: 36, 0.6632
Latitude: 32, 33.228 , Longitude: 36, 0.6588
then to try to find the distance between them i use this Link, but i surprised that the distance calculated is 50 meters !!!!!
how can i go over this problem !