what is satnav

Satnav is an abbreviation for satellite navigation. It is a system that uses satellites to provide autonomous geopositioning. Satnav systems operate independently of any telephonic or internet reception, though these technologies can enhance the usefulness of the positioning information generated. A satnav device is a user equipment that uses one or more of several global navigation satellite systems (GNSS) to calculate the devices geographical position and provide navigational advice. Depending on the software used, the satnav device may display the position on a map, as geographic coordinates, or may offer routing directions. Satnav devices can retrieve location and time information from one or more GNSS systems in all weather conditions, anywhere on or near the Earth's surface. Satnav is commonly used in vehicles to guide drivers and improve safety and efficiency of the journey.