Dynamic Positioning Data - Miscellaneous Tab
- Last UpdatedDec 18, 2025
- 2 minute read
This calculation allows you to specify a design environment in terms of wind and current speed, and sea-state. For a selected range of environmental directions, the thrust required to balance with the design environment is determined and hence the maximum thrust required by each unit can be determined.
Note:
Rudder effects cannot be included in this option.
Wind
|
Wind Speed |
The wind speed (knots) at which the thrust calculations are to be performed. |
|
Initial Wind Direction |
The first wind direction (degrees). |
|
Step |
The wind direction step (degrees). |
|
Maximum Wind Direction |
The maximum wind direction (degrees). |
Waves
|
Significant Wave Height |
The significant wave height used to calculate the wave drift forces. A default value (based on the wind-wave relationship specified on the Dynamic Positioning Data - Miscellaneous Tab page) can be selected by checking the Default box. |
|
Average Wave Period |
The average wave period used to calculate the wave drift forces. A default value (based on the wind-wave relationship specified on the Dynamic Positioning Data - Miscellaneous Tab page) can be selected by checking the Default box. |
|
Wind-Wave Offset |
The wave direction may be specified relative to the wind direction by giving an offset in degrees. A zero offset assumes that the wind and waves are coincident. |
Current
The current direction may be specified in a similar way or may be fixed in one direction which will usually be either head on or beam onto the vessel.
|
Fix Current Direction |
Checking this box will mean that the current will be fixed in one direction for all wind headings. |
|
Current Speed |
The current speed (knots). |
|
Current Direction |
The current direction (degrees). This is only required if the current direction is fixed. |
|
Wind-Current Offset |
If the current direction is not fixed, then an offset from the wind direction may be entered (in degrees). |
Available Thrusters
The thrust calculations can be performed with some thrusters inactive. Uncheck the Available box(es) if thrusters are unavailable for this run.
Note:
A minimum of 3 thruster units must be available to perform the thrust calculations.