Instability of position reference systems

Considerations from the above event:

  • It is not clear from the report whether it was the differential correction signal or satellite constellation that was  shielded, however operators need to be aware of shielding and shadowing in similar situations.
  • The GNSS constellation screen should be consulted and considered prior to moving closer to a possible obstruction.
  • The reflector for the radar system might not have been sited for optimum performance; did the crane shield the radar from the reflector?