This object sets a PDOP mask, expressed in hundredths and rounded to the nearest hundred, above which the GNSS receiver stops collecting position data. Admins tune it to reject satellite geometry that would produce an unreliable position fix, protecting the accuracy of any self-survey or location output. For example, setting f3GPSReceiverPortPDOPMask to 200 means the receiver halts data collection whenever its calculated PDOP exceeds 2.00, a level of geometric uncertainty considered too poor to trust.