## Synchronization

To prevent data discrepancies in the bridge network, the information from the Master ECDIS takes priority.

Any Backup ECDIS on the bridge network can synchronize data with the Master:

- ENC
- Settings
- Individual user settings: setting presets, ENC presets

### ENC Synchronization

ENC synchronization is only possible with the **Cloned key** (Clone) license option, which allows using a single ENC collection on multiple workstations. When this option is activated on multiple Bridge ECDIS, hardware keys with the same **HW_ID** are installed.

```{important}
ECDIS supports operation with up to 5 stations sharing the same HW_ID.

This means one set of ENC can be installed on 5 stations with a single set of ENC licenses (Cell Permits).
```

When ENC is updated on the **Master** station, the **Backup** stations will display a notification about the ENC collection change.

Without this option, only the user chart (**User Chart**) is synchronized.

```{attention}
If the **Cloned key** option is not enabled, ENCs will be synchronized, but encrypted cells will not be displayed.
```

ENC synchronization is performed in the following cases:

- Installation of new ENC into the collection
- Receipt and application of ENC updates
- Addition of new Cell Permits
- Addition, deletion, or modification of certificates
- Execution of manual ENC updates
- Creation or deletion of new Mariner's Objects

**Synchronize ENC on the Backup ECDIS:**

| Menu path |
|-------------|
| {{ menu }} → {{ settings }} → System → Workstations → Synchronize with the Master → Charts → Sync |
| or |
| {{ btn_backup_mode }} → {{ btn_master_mode }} → Workstations → Synchronize with the Master → Charts → Sync |

**ENC synchronization dialog:**

![](images/image550.png)

The window displays the progress of chart collection synchronization between the Backup and Master ECDIS.

```{warning}
After ENC synchronization, the workstation will automatically restart. Ensure that the restart will not affect current navigation operations.
```

```{important}
The synchronization time for chart collections depends on the volume of charts on the ECDIS. All collections are synchronized, including those with expired licenses.
```

### Settings Synchronization

Settings synchronization is performed in the following cases:

- Changes to vessel dimensions (e.g., towing)
- Changes to registration data
- Changes to sensors (configuration, binding, connection parameters, sentence filter changes)

**Synchronize Settings on the Backup ECDIS:**

| Menu path |
|-------------|
| {{ menu }} → {{ settings }} → System → Workstations → Synchronize with the Master → Settings → Sync |
| or |
| {{ btn_backup_mode }} / {{ btn_master_mode }} → Workstations → Synchronize with the Master → Settings → Sync |

```{important}
ECDIS performs **only** the synchronization of settings saved to a {doc}`settings set </sections/system-settings/settings-management/index>`.

If no saved set exists on the Master, synchronization will not be performed.
```

After settings synchronization on the Backup ECDIS, the {doc}`**Settings Management** </sections/system-settings/settings-management/index>` section will display a list of settings sets identical to the Master's settings sets list.

To apply the required set on the Backup ECDIS, select and apply the set as described in the {doc}`**Settings Management** </sections/system-settings/settings-management/index>` section.
