## Vessel Dimensions

| Menu path |
|-------------|
| {{ menu }} → {{ settings }} → Ownship → Dimensions |

Vessel dimensions must be **configured**. Based on the configured vessel dimensions, charted hazard monitoring is performed both during {doc}`voyage planning </sections/routes/route-verification/index>` and {doc}`track plotting </sections/routes/track-plotting/index>`.

```{important}
At each ECDIS startup, a settings check is performed: vessel dimensions and safety contour values. If any of these settings have not been configured by the navigator, ECDIS will display a warning: "Dimensions not set. Safety contour and/or vessel height, water level not established."
```

![Dimensions not set warning](images/dimensions-warning.png)

![Vessel dimensions input form](images/Dimensions_1.4.png)

### Vessel structural dimensions

| No. | Parameter | Description |
|---|----------|----------|
| 1 | **Privileges** | Obtain elevated privileges to edit vessel dimensions |
| 2 | **Vessel diagram** | Visual representation of the vessel and input parameters |
| 3 | **CWL (Constr WL)** | Construction waterline on the vessel diagram |
| 4** | **Actual air draught** | Calculated vessel height accounting for water level excess; used during transit monitoring and route safety assessment |
| 5 | **Under-keel clearance** | Minimum under-keel clearance |
| 6 | **Draught current** | Current vessel draft |
| 7 | **CWL (Construction waterline draft)** | Draft at the construction waterline |
| 8 | **Maximum draft (static)** | Draft at full load |
| 9 | **Height from construction waterline** | Height of the highest point of the hull or cargo from the CWL |
| 10 | **A and B** | CCRP offset relative to the bow and stern of the vessel |
| 11 | **C and D** | CCRP offset relative to the vessel's sides |
| 12 | **Default data** | Default values used during {doc}`route creation </sections/routes/route-creation/index>` and navigational safety zone calculation |
| 13 | **Anchor hawse-hole** | Position of the anchor hawse-hole in vessel coordinates. Required for correct calculation and monitoring of {doc}`anchor watch </sections/instruments/anchor-watch/index>` |
| 14 | **Barge dimensions** | Enables configuration of barge and combination dimensions |

```{note}
Vessel dimensions are entered by specifying the position of the common reference point (CCRP). Changes to the values in fields A, B, C, and D shift the CCRP relative to the bow/stern and port/starboard sides. The sum of fields A and B equals the vessel's length, and the sum of fields C and D equals the vessel's beam.
```

### Barge settings

![Barge dimensions input form](images/Barge_1.6.png)

| No. | Parameter | Description |
|---|----------|----------|
| 14 | **Barge dimensions** | Enables configuration of barge and combination dimensions |
| 15 | **Barge diagram** | Visual representation of the barge and input parameters |
| 16 | **CWL (WL)** | Construction waterline on the barge diagram |
| 17 | **Under-keel clearance** | Minimum under-keel clearance for the barge |
| 18 | **Draught** | Current barge draft |
| 19 | **Actual air draught** | Calculated barge height accounting for water level excess; used during transit monitoring and route safety assessment |
| 20 | **CWL (Construction waterline draft)** | Barge draft at the construction waterline |
| 21 | **Maximum draft (static)** | Maximum barge draft |
| 22 | **Height from construction waterline** | Height of the highest structure or cargo on the barge from the CWL |
| 23 | **Barge position** | Formation of the combination<br>![Barge on the port side (side view)](images/Barge_2.png) |

```{caution}
When entering the barge height, enter the height of the cargo, not the barge's own height. Oversized structures carried on the barge may exceed the towing vessel in height. Failure to account for cargo height may result in an incorrect assessment of the combination's clearance along the route.
```

### Tug-barge combination configurations

```{important}
When forming a tug-barge combination, in accordance with IMO recommendations, the combination is treated as a single vessel. The outline is calculated as the addition of the barge to the vessel and is then used for both route safety verification and charted hazard monitoring.
```

```{important}
Fields **E** — Barge length and **F** — Barge beam.
```

#### Alongside towing, barge on the port side

| Diagram | Outline |
|-----------|------------|
| ![Barge on the port side (side view)](images/Barge_1.4.png) | ![Barge on the port side (top view)](images/barge-port-top-view.png) |

#### Alongside towing, barge on the starboard side

| Diagram | Outline |
|-----------|------------|
| ![Barge on the starboard side (side view)](images/Barge_1.5.png) | ![Barge on the starboard side (top view)](images/barge-starboard-top-view.png) |

#### Push towing, barge ahead of the vessel on rigid coupling

| Diagram | Outline |
|-----------|------------|
| ![Push towing (side view)](images/Barge_1.3.png) | ![Push towing (top view)](images/barge-bow-push-top.png) |

#### Astern towing, barge behind the vessel on towline

| Diagram | Outline |
|-----------|------------|
| ![Astern towing (side view)](images/Barge_1.2.png) | ![Astern towing (top view)](images/barge-stern-tow-top.png) |

```{note}
When towing on a towline, the towline length should be added to the barge length. The current towing calculation model does not account for the free movement of the barge. The combination is treated as a rigid vessel hull.
```

```{important}
When vessel dimensions change, including when forming a tug-barge combination or changing the draft of the vessel or barge, **verified routes will change their status to "Not verified"**. Before activating a route, perform a route safety check with the new dimensions and, if necessary, adjust the route before the voyage.
```

```{important}
When forming a tug-barge combination, note that ECDIS calculates the safety contour relative to the object with the greatest draft, and vertical clearance monitoring is performed based on the greatest height.
```

### Default data

```{note}
Default values are elements used for route construction. When creating a route, the entered values are applied to the new route. The navigator can change them later.
```

![Default values](images/Dimensions_1.6.png)

| No. | Parameter | Description |
|---|----------|----------|
| 1 | **Turning radius** | For economic speed and a rudder angle of 15° |
| 2 | **ECO speed** | Economic speed of the vessel |
| 3 | **Maximum drift angle** | Maximum predicted drift of the vessel (combination) during the voyage |
| 4 | **Deviation portside** | XTD to the left of the route axis |
| 5 | **Deviation starboard** | XTD to the right of the route axis |

### Additional recommendations

```{warning}
The values of **height, draft, and clearance** affect **alarm and warning generation** and are also used for **depth calculation** in the echo sounder. Incorrect settings may cause false safety system activations.
```

```{note}
The values of height, draft, and clearance affect alarm and warning generation, as well as depth calculation (see {doc}`**Echo sounder** </sections/sensors/echo-sounder/echo-sounder-features/index>`).
```

### Settings quality control

```{tip}
It is recommended to regularly verify the correctness of entered vessel dimensions when: changing cargo type, adjusting draft, and forming a tug-barge combination.
```

```{warning}
Incorrectly set vessel dimensions may lead to conditions contributing to accidents.
```

```{important}
It is recommended to regularly update the current vessel draft values.
```
