Sony SLT-A77V Instruction Manual (Large File - 18.18 MB) - Page 219

GPS (SLT-A77V only) This system allows you to pinpoint your exact location on the earth. The GPS satellites are located in 6 orbits, 20,000 km above the earth. The GPS system consists of 24 or more GPS satellites. A GPS receiver receives radio signals from the satellites, and calculates the current location of the receiver based on the orbital information (almanac data) and travel time of the signals, etc. Determining a location is called "triangulating." A GPS receiver can determine the location's latitude and longitude by receiving signals from 3 or more satellites. • As the positions of GPS satellites vary constantly, it may take longer to determine the location or the receiver may not be able to determine the location at all, depending on the location and time you use the camera. • "GPS" is a system for determining geographic location by triangulating radio signals from GPS satellites. Avoid using the camera in places where radio signals are blocked or reflected, such as a shadowy place surrounded by buildings or trees, etc. Use the camera in open sky environments. • You may not be able to record location information at locations or in situations where radio signals from the GPS satellites do not reach the camera as follows. - In tunnels, indoors or under the shade of buildings. - Between tall buildings or at narrow streets surrounded by buildings. - In underground locations, locations surrounded by dense trees, under an elevated bridge, or in locations where magnetic fields are generated, such as near high voltage cables. - Near devices that generate radio signals of the same frequency band as the camera: near 1.5 GHz band mobile telephones, etc. On triangulating errors • If you move to another location right after turning on the camera, it may take a longer time for the camera to start triangulating, compared to when you stay in the same place. • Error caused by the position of GPS satellites The camera automatically triangulates your current location when the camera receives radio signals from 3 or more GPS satellites. The triangulating error allowed by the GPS satellites is about 30 m (98 feet). Depending on the environment of the location, the triangulating error can be greater. In this case, your actual location may not match the location on the map based on the GPS information. Meanwhile, the GPS satellites are controlled by the United States 219 Trouble shooting/Others (Advanced operations)