Deep contour definition9/1/2023 ![]() Unfortunately, in most cases a ship cannot approach the port or an anchorage area because such area are located inside the Safety Contour. At a first glance, this seems to be a good idea, a way to enhance safety allowing for an extra margin. In turn, this creates a situation where the ship can safely navigate in an area deeper than 11 meters but the ECDIS will mark non-navigable from 15 meters to the shore, limiting the sea room available. As per IMO Resolution MSC.232(82):"ADOPTION OF THE REVISED PERFORMANCE STANDARDS FOR ECDIS": “If Safety Contour value set by the operator is not available among the available depth contour of the ENC, then the ECDIS will select the next deepest available contour in the ENC” (IMO, 2006). Therefore, it can often happen that the Safety Contour value selected by the operator and entered in the ECDIS does not coincide with one of the contours embedded into the ENC’s cell.įor example, if 11 meters value has been entered as Safety Contour in the Depth Contour page, the system will select the next deeper available contour, most likely the 15-meters contour. Unfortunately, this concept does not fully reflect the reality (unless High Density Bathymetric ENCs are then used). Usually, the ENCs are compiled with standards contours 5, 10, 15, 20, 50, 100 meters. The Safety contour is the thick bold line on the screen that divides the navigable waters from non-navigable areas. The ECDIS gives the mariner the option to highlight, with different colours, various ENCs depth areas. ![]() (For more info on this topic read the article available here).īefore commencing any voyage, the mariner must set an appropriate value for the Safety Contour based on the vessel’s dynamic draught and required under-keel clearance, taking into consideration the quality of the ENC data available and expected operating condition. The Safety Contour value controls the visualization of the Generic Isolated Danger symbol.The Safety Contour and the Safety Depth trigger the ECDIS Anti-grounding function (If activated) during the Execution and Monitoring phase of the voyage.An alert is given by the Automatic Route Check if the track and/or the route corridor intersects the Safety Contour or the Safety Depth. ![]()
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