position jumping before fix. Not always

Bild von BojanKrstić

Hello! I am using BT747 for some time now, problem wich I have are position jumps and also log these jumps, in the start period of logging (see the picture). Is there any way to solve this, because it is not always present? Are there any setting in GPS data logger?


Bild von mdeweerd

Hi this is essentially


this is essentially because you are in a building where reception is bad.

Currently with BT747 the best approach is to filter on the HDOP or PDOP value which you must log.

The best limit depends on several parameters, but usually limiting the accepted HDOP value to 1.0 to 1.2 is sufficient to filter out most of thes erratic positions.