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Route Planning With ECDIS

December 4, 2019


What is voyage planning who is responsible how do we comply with the rules and how do we utilize the features and functions available enactus the purpose of voyage planning is to support the bridge team and ensure that the ship can be navigated safely between ports from birth to birth a voyage plan should cover ocean coastal and pilotage waters and according to St CW regulations be planned in advance avoid plan should aim to establish the most favorable route while maintaining appropriate margins of safety and safe passing distances offshore the following factors are amongst those that should be taken into account the marine environment the adequacy and reliability of charted hydrographic data along the route the availability and reliability of navigation aids coastal marks lights and radar conspicuous targets for position fixing along the route the type of cargo can influence route selection any routine constraints imposed by the ship for example draft type of cargo etc if possible avoid areas of dense traffic take into account weather forecasts KarenT tied wind swell and visibility conditions if possible avoid areas with unsure set or areas where onshore set can be expected whenever possible follow traffic separation schemes and fellowship reporting procedures technical systems before departure and if possible take into account previous experience of their reliability take into account your own experience with the planned route and type of ship there are four main stages in the planning of a safe voyage appraisal IE the collection of information and validation of all relevant information planning IE the presentation of the raw data into information and the strategy to be used the execution of tracking voyage and communication control monitoring I ensuring that the voyage plan is being followed voyage planning can be done the traditional way by using up-to-date paper charts and other relevant nautical information if an electronic chart display information system with approved and up-to-date electronic navigational charts is available such as system offers many possibilities for professional and efficient voyage planning in the following pages a description of functions which may be found on an active system is described a base display represents the minimum amount of information permitted in a chart on the screen a typical base display shows the following information coastline indication of subsea dangers traffic systems after startup of the active system normally a so-called standard display is presented on the screen a standard display normally includes the following information coastline indication of subsea dangers traffic systems chart boundary age to navigation caution areas caution notes the navigator decides which elements are to be included in the standard display other than the base display information which is always included all other information in the charts database may be displayed on operator requests where needed examples of such information our past track pass track labels spot soundings depth curves cables land details place-names object names for example boy names and numbers seabed text light ranges scale bar labels latitude/longitude scale the zoom function allows the navigator in different ways to select the appropriate chart scale for the actual situation the pound function allows the navigator to move the current chart on the screen in such a way that the appropriate chart segment is shown on the screen most active systems can operate in two modes routine monitoring route planning an active system when powered up will normally automatically start in route monitoring mode and display its own ships position on the chart the following definitions of a route plan can be used in connection with a cactus a route plan is a description of how voyage is to be carried out the simplest version of a route plan consists of waypoints drawn in the chart straight lines which show the intended sailing between points connect the waypoints to each other a waypoint is a position where the ship’s course is to be changed waypoints can normally be inserted by pointing to the required position in the chart or typing in the actual latitude and longitude from the keyboard the line connecting to waypoints is referred to as a leg enactus every stored route and waypoint get its own unique identifier a ship’s course change can be described in detail by specifying the turn radius the actual circle segment will be drawn on the chart the off-track limit specifies a distance on both sides of the course line the off-track limit is used to control the ship’s deviation from the plan to track the decision we’re on a given course line the next Waypoint should be located can under certain circumstances be decided by a certain distance to a known mark two marks observed through a straight line the term point functions allow the navigator to use these criteria to determine these points geometrically in the chart picture the following information may be inserted in the route plan the route name the start time for root waypoints for each waypoint the following information may be inserted the Waypoint name the position longitude and latitude the wait time at waypoint the turn radius the message the turnpoint the off-track limit the cruise speed the max speed based on these data the active system can automatically calculate the number of waypoints on the route the estimated time of arrival the course of each leg the length of each leg waypoints and corresponding data can be changed or removed waypoints can easily be moved on the chart when a waypoint is moved the part of the route that is affected is changed correspondingly this means that it is easy to see the consequences of moving a waypoint all routes in an area are drawn on the chart screen in addition an overview of all pre-programmed roots in this area is displayed in a list the navigator can select a suitable root for the voyage from this list specifying the waypoints can create new route plans in addition new route plans can be created based on existing plants create a new route by making a copy of an existing route and then modifying it existing route when a route planning process is completed it is not only recommended but also good seamanship to require that the route be validated this implies that the system checks that the route with off-track limits does not cross the safety contour some active systems on today’s market can import and export electronic chart and routes to and from integrated navigation systems press the red square to install charts the safety contour is the most important safety feature found in a nexus system a safety contour is a line in the chart the defines waters with safe depth in relation to the actual ship the active system continuously checks if the ship within a specified time may cross the safety contour and if so gives an alarm the navigator can choose the depth contour as the safety control or he can specify his own safety contour press the red squares to change the safety contour when pairing up an activist the system automatically starts in routine monitoring mode and displays own ships position on the chart in this example the chart is displayed in night colors with North up this is the standard ship symbol used on active systems the direction of the course and speed vector connected to own ship symbol is the course and speed made good the length of the vector is proportional to the speed of the ship each line segment represents one minute when the ship is showing true scale on the chart the concentric circles are substituted by the contour of the ship own ship is by default located in the center of the display the operator can change this position additional information may be presented in a separate window or Windows the navigator can turn this window on and off the following information may be displayed in the window the date and time the chart scale and original scale the elements included in standard display the current route with data for active waypoint the range and bearing with positions the chart units of measurement depths and Heights enc date and data last update of the original chart various mode data messages as default the chart on the screen is oriented Northup and the ship moves in the chart the same way as on a North stabilized trumotion radar display a scale bar is always shown on the chart the navigator may find course and distance from the ship to any point in the chart or between any two points in the chart in addition to course and distance the positions for the points are presented the navigator may display all available roots on the screen and select a suitable root for the voyage all data about the waypoints are presented in a waypoint list during sailing the navigator may introduce changes to the active route this is done by moving a waypoint to the ship’s position or creating a new weight point in the ship’s position the electronic chart is object-oriented this means that when the navigator select an object in the chart all available information in the chart database about the selected object is displayed the navigator a note function can be looked upon as The Navigators second memory the navigator can pointed to navigators note symbol in the chart and get the information connected to that symbol displayed on the screen the navigator may introduce new notes in the chart by pointing on the required position for the new note and typing the actual notes text the active system is required to receive input from the best position sensors available at any one time however when the automatic position sensors failed to provide input to the actus manual specification of data as possible whenever manual input is used information given by the actus must be used with great care parameters can be changed in monitoring mode the grounding alarm time the ship vector length the ship bearing line length the past track to be displayed the past track time label interval when an off-track limit is defined for the current route an alarm will be given to the navigator whenever the ship’s position is outside this limit if own ships position course and speed is calculated to lead to a grounding an alarm will be given at the time specified for example 6 minutes prior to the expected grounding on most active systems tracked targets provided by an office system can be displayed on the active screen targets from our / are shown on the actus display with their own symbol normally there is a limit to how many r / derive targets can be displayed on the actus there are active systems on the market today can handle 50 RP targets

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2 Comments

  • Reply shailesh singh January 4, 2019 at 8:24 pm

    nicely n in deep manner explained…

  • Reply pankaj sharma March 8, 2019 at 7:03 am

    thx for sharing valuable info.

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