• Playing with @BillM 's code. Despite forcing AT6558(R?) into the SBAS mode by sending

    "PCAS15,4,FFFF"
    

    to the chip, the error is still over 7 meters.
    Is there a way to get the error below 2 meters as stated in most SBAS articles?

    UPD:
    After taking weighted by time between records average of recorded coordinates at a static point and comparing those average coordinates to the true coordinates, the error seems to be closer to 20 meters.

    UPD2:
    The command checksum is not included in the post. When the command is sent to the GPS chip the checksum is added.

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