[Loadstone] gps receivers

Rob Melchers rob at loadstone-gps.com
Tue May 19 17:00:02 BST 2009

Speed deviation as reported in the NMEA log analyzer is the difference 
between receiver reported speed and calculated speed (software speed=on in 
LS). Actual speed deviation only can be measured in test conditions that 
assure constant speed and accurate speed measurement. The deviation as 
mentioned first (receiver vs calculated) for most receivers so far tested 
lies between 0.5 and 1.5 KM/H. The I-Blue737a+ receiver reports as follows:

Speed diviation: 1.37 KM/H (average speed=2.5 KM/H, differential fix)
Speed diviation: 2.13 KM/H (average speed=35 KM/H, differential fix)
Speed diviation: 1.03 KM/H (average speed=3.0 KM/H, no differential fix)


At 5/19/2009, you wrote:
>Is it true that I-Blue 737A+ reports quite huge speed deviations in 
>comparison to Royaltek RBT-2110? Have you perhaps notice something like that?

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