National GPS Network
| National GPS Network ： ウィキペディア英語版|
The British National GPS Network, known as OS Net, is a network of global navigation satellite system GNSS base stations covering Great Britain. It is managed by Ordnance Survey.
It provides access to a stable, national coordinate reference system (through downloaded GNSS data) that allows highly accurate location to be determined using suitable equipment, and is used in surveying, construction and precision agriculture industries, among other uses. The use of ground based stations make this system more accurate than satellite based GPS systems.
Using a single receiver, without any additional corrections, a civilian user can achieve a positional accuracy equal to 5m – 10m 95% of the time, and a height accuracy of 15m – 20m 95% of the time. Combined with data or corrections from a service such as OS Net, a positional accuracy of 1–2 cms is achievable, depending on the equipment used and environmental factors〔(【引用サイトリンク】url=http://www.ordnancesurvey.co.uk/business-and-government/help-and-support/navigation-technology/os-net/gnss-positioning-services.html?q=afaq1#faq1 )〕
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