2. Navigation Tasks
2-2
2.2.1 Route planning
A route can be created two ways: Modify an existing route to create a new route or create a new route from scratch.
A route consists of the following:
• Position of each waypoint • Safe water calculation based on safety limits
• Turning instructions for each waypoint • Required steering accuracy for individual legs
• Safety limits between waypoints (channel limits) • Speed restrictions for legs
Information notebook:
• Information pages to alert the operator to a given waypoint or a selected area.
• Automatic and/or manual notebook function to tell operator position-based information.
Voyage optimization parameters: See "voyage optimization" below.
2.2.2 Route calculation
Route calculation for voyage planning includes the following:
Route profile calculation:
• Distance between consecutive waypoints • Total distance
• Course between waypoints • Estimated time for voyage
• Calculation of wheel over point
Route check: Grounding alert based on available depth information in digital chart database.
Voyage optimization:
• Timetable optimization
• Optimization based on economical factors
The ECDIS processor calculates optimum speed and course between each waypoint, ETA, and fuel consumption,
based on the defined data. There are four calculation strategies: Max. Speed, Timetable, Lowest Cost and Best
Profit. In case of Great Circle sailing between two waypoints, the ECDIS calculates minimum and maximum
latitudes, and if needed adds an extra waypoint(s) so as not to exceed minimum and maximum latitudes.
2.2.3 Chart planning
Chart planning consists of the following steps:
1. Load new S57 and ARCS charts.
2. Update existing S57 and ARCS charts.
3. Manage chart permits.
4. Manually update charts.
2.2.4 User chart planning
User chart planning consists of the following steps:
1. Create operator navigation charts.
2. Process chart alerts based on symbols, lines and areas of user chart.
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