### Radar Overlay

**Optional**

ECDIS implements an additional option for overlaying **radar imagery** on the ENC. The source of **radar imagery** is a radar processor or a network navigation radar.

When overlaying radar imagery, the radar image is converted from azimuthal projection to the chart projection (Normal Mercator conformal cylindrical projection) and the radar image scale is adjusted to the current ENC scale.

```{important}
To display **radar imagery** on the ENC, enable the {doc}`Radar Layer </sections/graphical-user-interface/operational-settings/index>`.
```

```{warning}
ECDIS with **Radar Overlay** functionality is not a replacement for a navigation **Radar**.

The primary purpose of the function is to verify GNSS reliability and monitor the surface situation to identify discrepancies with the ENC.

The navigator must continuously monitor the correspondence between radar imagery and cartographic information and visual observations.
```

```{caution}
It is unacceptable to use **Radar Overlay** for determining target motion parameters, passing conditions, or calculating passing maneuvers.
```

```{danger}
The **radar imagery** transmitted to ECDIS is processed in the **radar**. The quality and completeness of **radar imagery** depend on the settings configured in the navigation radar.
```

```{warning}
This manual does not contain a description of methods and techniques for working with **radar imagery**. For correct use of **Radar Overlay**, the user must possess skills in working with **radar imagery**.
```

```{include} radar-source-creation/index.md
:relative-images:
```

```{include} rpu-setup/index.md
:relative-images:
```

```{include} miran-radar-setup/index.md
:relative-images:
```

```{include} asterix/index.md
:relative-images:
```

```{include} radar-overlay-features/index.md
:relative-images:
```

```{include} radar-source-removal/index.md
:relative-images:
```

```{include} radar-usage-recommendations/index.md
:relative-images:
```
