This object configures the elevation mask, in degrees from 0 to 90, below which the GNSS receiver ignores satellites near the horizon. Admins raise this mask at sites with obstructions or multipath interference near the horizon to prevent low-quality satellite signals from degrading the timing fix. For example, at a site surrounded by tall buildings, the admin raises f3GPSReceiverPortElevationMask to filter out unreliable low-angle satellite signals reflecting off nearby structures.