GPS accuracy

Hi Team,

I just want clarity on 2 points related to accuracy of nRF9151 GPS.

1) As shown in datasheet, "Positioning accuracy (CEP50), periodic tracking" is 3.4m. So that means only 50% of the time device will be able to track the location within 3.4 meters and remaining 50% of the time it will be outside of the 3.4 meters. Please let me know if this is correct understanding or not. If correct than is there any accuracy number associated with CEP100 or any other higher CEP value?  

2) Secondly datasheet mentions accuracy numbers for 2D fix. I want to know the accuracy numbers related to 3D fix. and also does nRF9151 supports 3D fix or not? 

Regards

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