## Chart and Object Information

The **Chart and Object Information** tool allows you to obtain detailed information about objects and chart cells at a specified point on the chart.

### Tool activation

The tool is activated by clicking the information icon ![Information](images/info-icon.png) in the tool selection menu. The ECDIS cursor will change to ![Information cursor](images/info-cursor.png).

### Obtaining information

To **obtain information**, left-click (tap) the point of interest on the chart. The bottom window will display a tree with information.

![Chart and object information window](images/info-window.png)

### Information interface elements

| № | Element | Description |
|---|---------|----------|
| **1** | **Query point coordinates** | Displays the coordinates of the point being queried<br><br>Format: latitude and longitude in the selected coordinate system |
| **2** | **Chart** | ENC cell name<br><br>Expanded by left-clicking (tapping) the row<br><br> |
| **3** | **ENC cell** | Displays the ENC cell name and its attributes for which object information is being queried. If there are larger-scale ENC cells under the queried position, data will only be collected from the displayed cell |
| **4** | **Objects** | Expandable section with a list of chart objects<br><br>Expanded by double-clicking (double-tapping) the row<br><br>Contains all objects located at the specified point |
| **5** | **Object list** | List of all chart objects at the specified coordinates<br><br>Displayed when the "Objects" section is expanded<br><br>Detailed attributes can be obtained for each object |
| **6** | **Selected object indication** | Visual highlighting of the selected object or chart cell in the chart window<br><br>The object is highlighted on the chart when selected in the list |
| **7** | **Highlight (active)** | ![Highlight active](images/highlight-active.png) In active highlight mode<br><br>**Area objects** are highlighted with a background<br><br>Allows visual identification of objects on the chart |
| **8** | **Point object highlight** | ![Highlight active](images/highlight-active.png) In active highlight mode<br><br>**Point objects** are marked with a cross<br><br>Helps quickly locate an object on the chart by its symbol |
| **9** | **Highlight (inactive)** | ![Highlight inactive](images/highlight-inactive.png) In inactive mode<br><br>Object highlighting is turned off<br><br>Used to disable visual indication |

### Magnetic variation information (MAGVAR)

**Magnetic variation (MAGVAR)** is displayed in the information window. Double-clicking (double-tapping) the row opens a window with more detailed information.

![Magnetic variation information](images/magvar-info.png)

For detailed information about magnetic variation, see the [Magnetic Variation](#magnetic-variation) section below.

```{important}
**Only one object can be highlighted at a time!**

When a new object is selected, the previous one is automatically unhighlighted.
```

### Detailed object information

Detailed information can be obtained for each chart cell or object present in the table. To do this, double-click (double-tap) the entry of interest, after which a window with attributes and their values for the selected object or chart sheet will be shown.

#### Chart cell attributes

![Chart cell attributes](images/chart-attributes.png)

The window contains detailed information about the selected ENC cell, including:
- Cell name
- ENC compilation scale
- Issue date
- Update status
- Additional metadata

#### Object attributes

![Object attributes](images/object-attributes.png)

The window contains all attributes and their values for the selected object:
- Object type
- Category
- Description
- S-52 symbol
- Associated (dependent) objects
- Additional characteristics

![Additional attributes](images/additional-attributes.png)

### Magnetic Variation

If the ENC cell contains encoded magnetic variation data, the data will be displayed in the information window.

![Magnetic variation information in ENC](images/magnetic-declination.png)

**Information content:**
- Magnetic variation value for the given area
- Year of magnetic variation determination
- Annual rate of change
- Data accuracy
- Information source

### Tidal Currents

If the ENC contains encoded tidal current data, the data will be displayed in the information window as a tidal stream table.

![Tidal current information](images/tidal-currents.png)

**Information content:**
- Tidal current data at the specified point
- Current speed
- Current direction
- Tide phases
- Temporal characteristics

### Graphical Information

Chart objects may contain additional graphical information, for example: **information from navigational publications** or **graphical representation of an object**.

**When external data is available**, a corresponding entry will be displayed in the window. To view:
1. Double-click to view extended information
2. Then double-click the entry with the image in graphical format

### Operating features

**Viewing modes:**
- **Cell list:** view all ENCs at the query point
- **Object list:** view all chart objects at the point
- **Detailed information:** view attributes of the selected item

**Interactivity:**
- Clicking a row in the list highlights the object on the chart
- Double-clicking opens the detailed information window
- Highlighting can be turned on/off for visual control

```{tip}
**Use the information tool for quick access to data about objects on the chart without the need to construct graphical elements.**

The tool is especially useful when working with navigational objects, buoys, lighthouses, and other ENC elements to obtain their exact characteristics and purpose.
```

```{note}
All objects and chart cells displayed in the information window correspond to the current chart scale and selected display settings. When the scale or display settings change, the list may be updated.
```

```{note}
ASM and AIO data are also displayed in this window.
```
