GPS/GNSS is now a universal geographic positioning system. Its natural accuracy – within a few metres – makes it suitable for many applications destined for the general public, such as road navigation. Its navigation receivers (often GPS only) are inexpensive and are now built into low-cost applications for Smartphones and tablets.
Even greater precision is required for surveying and GIS (centimetric – our specialist field – or submetric), requiring the use of different means. We use: