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More details you can find here:WAAS, Wide Area Augmentation System, is the latest method of providing better accuracy from the GPS constellation. It is similar in principle the the DGPS capability that is built into all Garmin and many other units except that a second receiver is not required. Instead of a beacon receiver the correction data is sent via a geo-stationary satellite and is decoded by one of the regular channels already present in the GPS receiver.
IanP said:On how to build a low cost DGPS goto:
h**p://www.wombat.ie/gps/
However, there are some new solutions at hand, and they do not require additional equipment ..
More details you can find here:WAAS, Wide Area Augmentation System, is the latest method of providing better accuracy from the GPS constellation. It is similar in principle the the DGPS capability that is built into all Garmin and many other units except that a second receiver is not required. Instead of a beacon receiver the correction data is sent via a geo-stationary satellite and is decoded by one of the regular channels already present in the GPS receiver.
h**p://www.gpsinformation.org/dale/dgps.htm
Regards,
IanP