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What is the accuracy and precision of the Crux CompactFlash GPS card?

April 26, 2017card compactflash crux GPS precision

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What is the accuracy and precision of the Crux CompactFlash GPS card?

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The accuracy and precision of the Compact Flash GPS cards is largely dependent on the type of positioning available. Differential positioning via the WAAS system is significantly better than non-differential positioning. Positioning is also affected by satellite geometry, weather, and local topography. The following two charts give an idea of the repeatability of positioning fixes for the Crux CompactFlash GPS card versus a Garmin eTrex handheld GPS receiver. In both cases, the points were stored utilizing the TrackLog feature available in ArcPad. The Crux CompactFlash GPS card was attached to a model 3970 Compaq iPAQ, and the data was collected using an external antenna. The Garmin eTrex handheld GPS receiver was connected to a Winbook laptop computer via a serial port connection. The eTrex does not connect to an external antenna. 250 positioning fixes were recorded using each GPS receiver. The mean position was calculated, and the following graphs show horizontal and vertical deviati