| The ease and simplicity of satellite navigation or Sat | | | | (GNSS) allow small electronic receivers to determine |
| Nav devices have made them a welcome car | | | | their location within a few meters using time signals |
| accessories these days. The devices have made the | | | | transmitted by satellites. Based on their generations, |
| stressful car journey to an unknown location a | | | | the GNSS has been classified as GNSS -1 and GNSS |
| joyous occasion. These devices are equipped with | | | | -2. |
| features like turn-by-turn voice directions, highlighted | | | | Transit was the first satellite navigation system |
| points of interest (like ATMs, hotels, hospitals) which | | | | developed by the US military in 1960s. Satellite |
| have made them a much sought after personal travel | | | | navigation is regarded as a force multiplier |
| assistant. | | | | now-a-days. The system's ability to reduce |
| The Sat Nav systems provide you autonomous | | | | unintended casualties is of particular advantage in |
| geo-spatial positioning with global coverage. The | | | | wars where public relations are an important aspect |
| satellite navigation receivers combine signals from | | | | of warfare. The satellite navigation was originally |
| multiple satellites and reduce errors by using | | | | intended for military use but has found applications in |
| techniques such as Kalman filtering to combine the | | | | civilian use of late. Currently, the United States' |
| constantly changing data into a single estimate for | | | | NAVSTAR Global Positioning System (GPS) is the |
| position, velocity and time. The Sat Nav systems, | | | | only fully operational GNSS. |
| also known as Global Navigation Satellite Systems | | | | |