## Using **Radar Mode**

```{attention}
This manual is not a training guide for using the Radar. The navigator, independently, in accordance with their skills and experience, taking into account prevailing conditions and circumstances, controls the **MIRAN 09** Radar scanner, identifies the coastline and radar landmarks, selects and acquires radar targets for tracking.
```

When **Radar Mode** is enabled, in the ECS software:
 - the colour palette changes (the colour palette is designed so that light colours do not obscure the radar image and do not interfere with **radar image** readability);
 - a **Radar Mode** tab is added to the multi-function window (enabling the Radar scanner control function);
 - the target tracking and highlighting function is enabled.

![RM in USE](images/RM_7.png)

Navigational settings do not change when switching to **Radar Mode**.

Navigational settings (motion mode, chart orientation) are available in **Radar Mode**.

### ENC in **Radar Mode**

In **Radar Mode**, the ENC serves as a background layer.

When switching to **Radar Mode**, the chart display load remains the same as in the ECS.

```{tip}
It is recommended to prepare a preset chart display load in advance, so that chart objects do not obscure the **radar image** and are convenient for the navigator, and enable it when switching to **Radar Mode**.
```

![RM ENC on](images/RM_8.png)

ENC is disabled by pressing {{ btn_ENC_on }}, ENC is enabled by pressing {{ btn_ENC_off }}.

![RM ENC off](images/RM_9.png)

When disabling the ENC, a notification will be displayed:

![RM ENC off](images/RM_10.png)

When exiting **Radar Mode**, the ENC will be forcibly enabled.

### Routes in **Radar Mode**

![Route activate](images/RM_11.png)

When switching to **Radar Mode** during active route monitoring, the active route will be displayed on the screen.

![RM Route activate](images/RM_12.png)

Disabling the ENC does not affect route display and monitoring.

![RM Route activate without ENC](images/RM_13.png)

```{tip}
For convenience, it is recommended to enable **By Route** orientation, set the motion mode to **Relative**, and perform a fixed offset of the sweep centre closer to the bottom edge of the screen.
```

![RM Route](images/RM_14.png)

### Cursor in **Radar Mode**

In **Radar Mode**, a new cursor state has been introduced.

![ECS RM Cursor Menu](images/ECS_RM_Cursor_Menu.png)

| State | Function |
|-----------|---------|
|![ECS Cursor ARPA](images/ECS_RM_Cursor_Select_Target.png)| Select radar target |

The remaining cursor states are unchanged.

When switching to **Radar Mode**, the **Lens** and **Scale Change** functions become unavailable.

![RM Cursor Menu](images/RM_Cursor_Menu.png)

| State | Function |
|-----------|---------|
|![RM Cursor ARPA](images/RM_Cursor_Select_Terget.png)| Select radar target |
|![RM Cursor ARPA](images/RM_Cursor_Normal.png)| Normal cursor mode |
|![RM Cursor ARPA](images/RM_Cursor_Info.png)| Information about ENC objects. Available only when the ENC background layer is enabled |
|![RM Cursor ARPA](images/RM_Cursor_Mesurement.png)| **ERBL** |


### Manual Target Acquisition

In **Radar Mode**, the ECS processes the **radar image**, highlights radar targets, tracks them, assigns numbers, and calculates collision avoidance parameters for radar targets using the ARPA function.

```{important}
Radar target processing is performed manually. The navigator independently selects an echo on the **radar image** and places a marker on it. The ARPA function determines whether the selected echo is a target or not.
```

```{note}
The ECS in **Radar Mode** does not implement full ARPA functionality, does not generate or transmit sentences ``$--TLL``, ``$--TTM``, ``$--TLB``, and does not perform AIS target and radar target association.
```

Place a tracking marker on a radar echo.

![RM_ARPA_Select](images/RM_ARPA_1.png)

| No. | Description |
|---|---------|
| 1 | AIS target |
| 2 | Marker placed on the radar echo. The ARPA function processes information received from the highlighted **radar image** area |

![RM_ARPA_Select](images/RM_ARPA_2.png)

| No. | Description |
|---|---------|
| 1 | AIS target |
| 2 | If the radar echo is identified as a radar target, the symbol changes, the target vector and collision avoidance parameters are calculated. Throughout the radar target tracking period, the ARPA continuously refines the TCPA. |

```{caution}
The TCPA of an AIS target and a radar target, if they represent the same target, may differ. The quality of the calculation depends on the radar signal quality and Radar configuration settings.
```

![RM_ARPA_Target](images/RM_ARPA_3.png)

To view the target motion parameters and collision avoidance data, select the target on the screen.

![RM_ARPA_Target_Select](images/RM_ARPA_5.1.png)

The **ARPA** tab contains target data.

![RM_ARPA_Target_Data](images/RM_ARPA_5.2.png)

Target identification, visual association, collision avoidance analysis, and actions taken under current conditions and circumstances are the responsibility of the navigator.

![RM_ARPA_Target](images/RM_ARPA_7.png)
