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GPS signals can also be affected by multipath issues, where the radio signals reflect off surrounding terrain; buildings, canyon walls, hard ground, etc. These delayed signals cause measurement errors that are different for each type of GPS signal due to its dependency on the wavelength.
The Navigation Data Standard (NDS) initiative, is an industry grouping of car manufacturers, navigation system suppliers and map data suppliers whose objective is the standardization of the data format used in car navigation systems, as well as allow a map update capability.
In Japan, an automobile parts retail chain called "Autobacs" sells an in-dash navigation system built by Honda called "Gathers" that is compatible with the Internavi technology, and can install the equipment into any vehicle. Previous navigation technology that uses either DVD loaded maps or use a Hard Disk Drive may be compatible with Internavi.
The GPS week number rollover is a phenomenon that happens every 1,024 weeks, which is about 19.6 years. The Global Positioning System (GPS) broadcasts a date, including a week number counter that is stored in only ten binary digits, whose range is therefore 0–1,023.
Navteq's underlying map database is based on first-hand observation of geographic features rather than relying on official government maps. It provides data used in a wide range of applications, including automotive navigation systems for many car makers, accounting for around 85% of market share.
GEWI's traffic services are available on several models of Smartphones, PAPAGO!, Garmin and TomTom navigation devices, Honda and Toyota in-car navigation systems. In Nov 2010, the Land Transport Authority announced the release of the Location Table for Singapore.
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Garmin Ltd. is an American multinational technology company based in Olathe, Kansas. [3] [4] The company designs, develops, manufactures, markets, and distributes GPS-enabled products and other navigation, communication, sensor-based, and information products to the automotive, aviation, marine, outdoors, and sport markets.