Glossary
To enhance your enjoyment of this product, please familiarise yourself with the following terms.
 | GPS is a system that detects the current location (latitude, longitude, altitude) by receiving radio waves from 4 or more GPS satellites in normal situations, or sometimes from 3 satellites. These satellites are launched and managed by the US Department of Defense mainly for military use, but they are also open for private use. This unit performs navigation using GPS information, various sensors, and road map data. |
| The wide area map is a map of a large area, and the detailed map is a map of a small area. The scales of the maps are 1/20,480,000, 1/10,240,000, 1/5,120,000, 1/ 2,560,000, 1/1,280,000, 1/640,000, 1/320,000, 1/160,000, 1/80,000, 1/40,000, 1/20,000, 1/10,000, and 1/5,000. |
 | The quality of the GPS positioning is displayed in the top right of the menu screen. The greater the number of displayed symbols, the higher the precision of the GPS positioning. |
 | GPS calculates positions using triangulation. The distance to the satellite can be determined when the radio wave from that satellite is received, and the current location can be measured by receiving radio waves from 3 satellites. However, because there is a margin of error in the GPS satellites and navigation unit, positioning is performed in only the 2 dimensions of latitude and longitude when radio waves from only 3 satellites can be received. The precision will be lower in this case. When radio waves from 4 or more GPS satellites are received, positioning is performed in the 3 dimensions of latitude, longitude, and altitude. 3D positioning is more precise than 2D positioning, and it reduces the margin of error in the vehicle location display. |
