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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?

DP Event

Published: 30 June 2016
Download: IMCA DPE 02/16

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The following case studies and observations have been compiled from information received by IMCA. All vessel, client, and operational data has been removed from the narrative to ensure anonymity.

Case studies are not intended as guidance on the safe conduct of operations, but rather to assist vessel managers, DP operators and DP technical crew in appropriately determining how to safely conduct their own operations. Any queries should be directed to IMCA at [email protected]. Members and non-members alike are welcome to contact IMCA if they have experienced DP events which can be shared anonymously with the DP industry.

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