Monitoring Settings (Ground check settings)

Important

Designed for configuring parameters of navigational hazard highlighting on ENC, monitoring sector width, and navigational hazard monitoring lane.

Monitoring of navigational hazards, the safety contour in the vessel’s lane, and their display on the off-scale hazard indicator are performed regardless of the ENC display highlighting state.

Before using ECDIS, configure the hazard monitoring parameters in the sections: Ground check and Alarm filter.

Accessing settings

Menu path
→ → Grounding check → Settings

Monitoring configuration parameters

Monitoring settings window

No.	Parameter	Description
1	Safety contour	Selected from among the depth contours of the largest-scale ENC cell at the vessel’s position with the nearest value greater than the safety depth
2	Safety depth	Calculated based on the current vessel draft and current water level
3	Safety height	Calculated based on the current vessel draft and current water level
4	Draw Safety Zone	Enables display of the calculated navigational safety zone
5	Draw Sector	Enables display of the hazard monitoring sector
6	Set objects filter	Opens the Alarm filter window
7	Detection time (Forecast)	Performed either by time (dynamic forecast) or Detection range by a set distance (static forecast). Depending on the navigator’s preference, enter the value in the numeric field: time in minutes, or distance in km/nautical miles. Based on the set parameters, the radius of the hazard scanning sector ahead of the vessel will be formed.
8	Sector angle	Sets the width of the hazard scanning sector. The sector is calculated relative to the vessel’s course vector. The full sector angle is entered.
9	Draw Alert Limits	Enables display of the alert generation boundaries for detected navigational hazards — the dynamic maneuvering lane
10	Alert priority	Select the alert category for detected navigational hazards: Warning or Caution
11	Account the ENC Accuracy	Enables automatic accounting of CATZOC from the largest-scale ENC under the vessel’s position. ECDIS accounts for CATZOC values of categories A1 and A2. If the CATZOC value exceeds A2 (RMS > 20 m), ECDIS uses the manually entered CATZOC value in calculations
12	—	Current CATZOC value, CATZOC category, and the corresponding positional accuracy of underwater topographic features
13	Manual input	Manual entry of the CATZOC value. The value for CATZOC > A2 (RMS > 20 m) to be accounted for in calculating the maneuvering lane and navigational safety zone

Tip

When navigating in areas with abundant navigational hazards at low speeds, it is recommended to set the forecast method by time for the monitoring sector and dynamic lane.

In this situation, selecting the forecast method by distance may result in excessive clutter on the ENC with highlighted hazards and loss of situational awareness.

When selecting the Detection Time method at high speed, the scanning area will increase and the load on ECDIS will be significantly higher, which may cause user interface response delays, especially when navigating in areas with abundant navigational hazards. This is due to the large volume of objects being processed on the ENC. The most optimal monitoring method depends on the vessel’s characteristics and the navigation area.

Maneuvering lane calculation

The maneuvering lane is calculated using the formula:

$B_{t} = L\sin(drift) + B\cos(drift) + t_{c}\sin(drift)V$

where:

$L$ – length of the vessel or tug-barge combination, in meters
$B$ – beam of the vessel or tug-barge combination, in meters
$drift$ – current drift angle of the vessel
$V$ – current vessel speed, in m/s
$t_c$ – lead time equal to 180 seconds, in sec.

Navigational safety zone calculation

$AL = B_{t}\sqrt{m^{2} + c^{2}}$

where:

$B_t$ – vessel maneuvering lane width
$m$ – current root-mean-square error of the vessel’s position, entered manually by the user or received from the $--GSA sentence
$c$ – current CATZOC

Alarm Filter configuration

Configure the highlighting of navigational hazards on the chart in the Alarm Filter.

Menu path
→ → Grounding check → Alarm Filter

Alarm filter

No.	Parameter	Description
1	Navigational hazards	Enables/disables monitoring of point objects with a navigational hazard attribute
2	Areas with special conditions	Enables/disables monitoring of objects in the group
3	Areas with special conditions group	Detail of objects in areas with special navigation conditions
4	Safety contour	Enables/disables monitoring of the safety contour
5	User defined areas with special conditions	Enables/disables monitoring of objects belonging to the group
6	User defined areas with special conditions group: - Information areas (Anchor Berth, Cargo transhipment area, Fishing ground) - Protected areas (Dumping Ground, Incineration area, Pipeline area, Precautionary area, Cable area, Fairway, Territorial sea area) - Ships routing system and ferry routes - Miscellaneous (Depth contour, Continental shelf area, Exclusive zone)	Detail of objects in user-defined areas with special conditions

Configuration recommendations

Before configuring monitoring:

Ensure the current vessel draft is set correctly
Verify the sensor settings are correct
Set the current water level for correct selection of safety contour and safety depth

Safety configuration:

Select the forecast method (time or distance)
Set the monitoring sector and lane parameters
Configure the object filter for monitoring
Enable sector display on the chart for visual monitoring

Warning

The use of hazard monitoring does not replace the navigator’s professional judgment. The system warns of potential hazards, but the officer of the watch always makes the final safety decision.