An itinerary is a route divided into legs showing the planned locations and dates of the main stopovers from the start (initial departure) to the end (final arrival), which is the destination of the vessel's journey (also called voyage, trip, torn, or expedition).
Each leg has a departure and an arrival date and location. It may also have additional waypoints in between, which might be stopping points or course change points.
Itineraries for vessels at sea are never precise! We use three accuracy levels for the planning status to avoid confusion about what is likely to happen or not:
The duration of an itinerary is counted in days (start to end date) and the leg in nights (departure to arrival date). That is because you may arrive on a Monday and leave on a Tuesday. Therefore, there can be confusion if you were there for one or two days, but it would strictly count as one night without any confusion.
Therefore, you would say you went on a 14-day holiday or trip (the itinerary) and spent 13 nights on all your legs combined, for example.
There is also an important distinction between planning (what's the intention) and estimating (what's calculated). A time of arrival is always an estimate as a calculation is required; that's why it is called ETA (Estimated Time of Arrival).
You can't plan to leave San Francisco and arrive in Hawaii 10 minutes later, regardless of how desperate your intention is. If you intend to arrive in Hawaii by a certain date and estimate 10 days for the journey, then you can plan to leave San Francisco 12 to 15 days before. Therefore, your departure date is planned (what's the intention), and the arrival is still an estimate (what's calculated based on season, winds, currents, and many other factors). Plans can change due to weather, government requirements, breakdowns, delays, etc.
The following tips are worth noting to manage your itinerary and maintain an excellent overview:
Be realistic and mindful when planning an itinerary. People will arrange their timing and life around it, taking time off work, booking flights, arranging accommodation, etc. It's crucial to let the crew know how accurate they can expect the itinerary to be.
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