Considerations of the IMCA Marine DP Committee from the above event:
- Redundancy was lost; therefore, a yellow alert should be initiated.
- Good practice is to acknowledge and investigate the cause of alarms, even if they are intermittent, otherwise alarms can be missed.
- It should be noted that good practice is to restart the DP controllers as part of field entry trials and practice restart procedure during DP operational drills.
- The wisdom of having 4 DGNSS selected to the DP should be questioned. They are likely to be susceptible to similar faults and therefore provide a false sense of security. Also, the use of 4 position reference systems of the same type would create a bias and therefore dilute the effectiveness of the other selected systems.