The best tool for calculator field, perimeter, or area meter on a map: easy to use and useful for estimating the dimension of land on the map includes : - Use the latest GPS and location service technical for a good assessment result - Easy to search for the desired place - Process of metrology to output is a land dimension of field, estimate distance of a route - Define the outline of a field on the ground by clicking on the map then calculate superficies, circumferential, and distance