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GPS support
Below are links to a range of support resources for professional and enthusiast GPS users, rather than answers to frequently-asked questions about issues relating to in-car satnavs and similar.
A beginner's guide to GPS
Learn about GPS, how it works, the levels of accuracies you can expect using a single receiver and differential GPS respectively, how you can use GPS as a surveying tool and how our Active GPS Network can help you.
A guide to coordinate systems in Great Britain
This guide is written for people whose expertise is in fields other than geodesy, who need to know the concepts of coordinate systems in order to deal with coordinate data, and who need information on using mapping coordinate systems in Great Britain.
Using GPS with Ordnance Survey maps
If we were just using GPS, that would be the end of the story. However, we are often trying to relate our position to features on the map, which causes additional problems and errors, because GPS and Ordnance Survey maps use different models for the earth and coordinate systems.
An overview of the GPS system
The Navstar global positioning system (GPS) is a constellation of orbiting satellites that provides navigation data to military and civilian users all over the world. The system is operated and controlled by members of the 50th Space Wing located at Schriever Air Force Base (AFB), Colorado.
Satellite navigation system developments
GPS is being modernised in a programme lasting until around 2015. This will mean that GPS derived raw positions will become increasingly more accurate and quicker to determine. Even so, it is no longer the only eye in the sky.
See also OS Net support resources.