There are two different concepts here:
1. Tracking cutoff Mask for tracking WAAS GEO: set by WAASECUTOFF(default = -5) Mask for tracking CDGPS GEO or OmniSTAR GEO: (variable, automatically set) Mask for tracking GPS: set by ECUTOFF (default = 5)
2. Cutoff for using in solution based on position type SINGLE: all tracked WAAS/CDGPS: all tracked that have a correction available PSRDIFF: all tracked that have a correction available (could be limited by bases ECUTOFF) OMNISTAR: the VBS library will only generate a correction for sats above 5 degrees HP/XP: 8 degrees as set by OmniSTAR. This may be configurable by OmniSTAR in the subscription parameters, please contact OmniSTAR for more details.