跟读练习: ECDIS Safety depth settings - 通过视频学习英语口语
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ectus awareness series 3 chart depth setting very important for grounding prevention
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good morning third mate good morning captain how's it going very well sir we have no traffic
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and the weather is good that's good i am looking forward to our port call tomorrow morning me too sir
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Very good.
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Our arrival draft is 9 meters, and the coastal and port area may have many shallows,
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so I would like to reconfirm the ECDIS chart depth settings on the arrival ENC.
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Aye, sir.
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Here you go, sir.
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Thank you, third.
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It looks good.
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Our chart depth settings are in order.
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Third, do you know the importance of the ECDIS chart depth settings?
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Yes, sir.
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They are important.
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These settings organize the display of safe depths and unsafe depths.
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Yes, that is correct.
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There is no traffic and the weather is good.
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How about we refresh our knowledge about chart depth settings?
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Yes, sir.
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That would be great.
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Contours, as you know, are lines on a chart that join equal depths or equal heights.
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Chart depth settings refers to the value inputs by the user for the shallow contour,
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Safety Contour Safety Depth And Deep Contour Yes, sir.
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But, sir, how are these values decided?
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Good question, third.
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The ship's master decides the values of the chart's depth settings as per the ship manager's guidelines.
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But the first important thing to understand is how the ECTIS selects the contour for display.
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Most ENC cells usually only contain depth contours such as a 2 meter, a 5 meter, a 10,
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15, 20, 30, 50 meter,
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etc. The ECDIS is programmed to display depth contours equal to input values or the next higher available contour.
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For example, if the safety contour input is 15 meters, a 15 meter contour will be displayed.
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If a 15 meter contour is not available, the next higher 20 meter or higher contour will be displayed.
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Another example, as in our case, we have an input of 13 meters, but ENC does not have a 13 -meter contour,
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so the ECTIS will display the next higher available contour, such as a 15 -meter.
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I could understand it very well.
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I will explain the display with each type of depth contour and safety depth in a default setting of four -color display.
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the shallow contour outlines the shallow waters of high grounding risk
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depth less than the shallow contour is shown in blue color
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the vessel should never enter this area corresponding to the safety depth settings depths
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that are equal to and lesser than the safety depth will be shown in black bold fonts
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and soundings deeper than the safety depth in gray color the vessel must not plan passage over black bold soundings
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however if needed a vessel may do
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so only after confirming UKC in compliance with the ship managers
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guidelines the safety contour is the separation line between navigable water depths and depths less than the safety contour.
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The safety contour's value is.. equal to
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or greater than the safety depth waters between the safety contour
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and the shallow contour are shown in light blue color as per regulations the ecdis should give an alarm
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if within a specified time set by the mariner his or her own ship would cross the safety contour
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usually a vessel does not plan a passage across the safety contour towards the depths
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that are less than the safety contour however
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when necessary a vessel may do so only after confirming the ukc
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and marking the no -go areas in compliance with the ship manager's guidelines
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third let me share another important information about the safety contour
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and the isolated danger mark the generic isolated danger mark symbols identify the navigational dangers
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that have safe passing depths less than
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or equal to the safety contour setting it is important to note
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that the safety contour setting governs the display of the isolated danger mark symbols.
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By default, all ECDIS display these symbols only for the dangers that lie on the deeper side of the safety contour.
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When these dangers lie on the shallower side of the safety contour setting
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or when these dangers have depths greater than the safety contour setting, they are displayed with a black dotted line around them.
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However, do take note that on some EGDIS, such as in the case of the Furuno and JRC EGDIS,
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the user can select a setting to show isolated danger generic symbols, also on the shallower side of the safety contour.
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Therefore, the user must make the correct safety contour setting on the EGDIS.
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In addition, when planning courses or navigating in the vicinity of such dangers.
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Please check their details in advance by clicking on the respective symbol which will open the additional information about the dangers.
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Thank you, sir.
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This was indeed very useful and important information.
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The deep contour outlines the limit of deep water set by the user.
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Waters between the deep contour and the safety contour are shown in grey colour.
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Waters deeper than the deep contour are shown in white colour.
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Now, let us look at the kinds of colour displays available in an Ectis.
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The Ektis has two kinds of color settings, two -color and four -color.
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By default, the Ektis shows a four -color display.
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We have seen the four -color display with the earlier explanation.
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Now, let us see the two -color display.
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Yes, sir.
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The two -color display is simpler and it shows navigable and depth areas less than the safety contour in two colors.
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The two -color display is preferred by pilots and navigators, especially in shallow waters and during night navigation.
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The two -color display gets enabled by selecting the two -color depth setting.
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In this display, the light blue color from the four -color display is replaced by the blue color.
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Thus, the area between the safety depth and the zero depth is shown in a single blue color.
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The gray color from the four -color display is replaced with white color.
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The white color indicates safe waters with depths greater than the safety contour.
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In some cases, one may be able to navigate beyond the safety contour, but must keep clear of the depths less than the safety depth,
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indicated in bold black font.
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Sir, now I understand the difference between four color and two color displays very clearly.
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i hope you found this discussion useful yes indeed i could
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refresh my knowledge of charge depth setting thank you very much sir
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Thank you.
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