It is a portion of dynamic interface testing where test pilots evaluate all parts of the proposed wind/sea state envelope, giving each segment a grade as defined below
1. Reasonable pilot compensation required. Tracking and positioning accuracy is consistently maintained throughout the operation. Fleet pilots will have enough spare capacity to conduct ancillary tasks (eg. radio, Tq gauge, checks).
2. Significant pilot compensation required. Tracking and positioning accuracy are occasionally exceeded during peaks in ship motion, sea spray or turbulence. Fleet Pilots will have difficulty conducting ancillary tasks (eg. Radio, Tq gauge,checks).
3. Highest tolerable pilot compensation required. Repeated safe shipboardlaunch/recovery operations are achievable. Fleet pilots will be able to keep up with task requirements but no more. Degraded operations (ship or aircraft) arelikely to cause fleet pilot effort to become unacceptable. These points define the release limits recommended by (DERA).
4. Excessive pilot compensation required. Fleet Pilots will be purely reacting to external influences rather than anticipating them. Accuracy is poor in one or more axis. Fleet pilots under operational conditions could not consistently repeat these evolutions safely.
5. Extreme pilot compensation required. Repeated safe evolutions are not possible even under controlled test conditions with fully proficient crews.