Although it doesn't sound particularly adventurous to plan a short trip it does make you (a) consider all of the possibilities and (b) gather the information you need and draw up a contigency plan should things change. This makes the actual trip a lot more relaxed as you are able to concentrate on sailing the boat and enjoying the day. Below is a list of factors that your instructor or skipper will take into account when planning a trip.
Why are you going? What is the purpose of the trip? A yacht delivery made by a proffessional crew for instance will be planned very differently from a holiday pleasure cruise with small children onboard, even though they might be sailing to and from the same place.
The constraints imposed usually dictate the best course of action in a plan. These can include the boat, the crew, the length of the passage, the time of year and daylight hours, tidal heights and streams and fuel consumption to name a few.
The potential hazards that may need to be taken into account include the weather, the wind and sea state, the expected visibility, rocks, shoal areas, shallows and any special operations in progress such as dredging or cable laying. There are many more potential hazards which need to be considered and investigated whilst planning a trip.
Aids to navigation should always be noted and utilised. These can include idetifying marks on the land such as lighthouses, church spires and towers as well as geographical marks like a distinctive headland or rock formation. Navigational marks at sea are obviously of great importance and should always be noted and clearly identified by position, shape, colour and light sequence if lit. Other aids include the echo sounder in conjunction with charts and tidal information and of course the ubiquitous array of electronic aids such as GPS (global positioning system) receivers, chart plotters and AIS (Automatic Identification System) that abound onboard modern boats.
Bearing all of the above information in mind the instructor or skipper will plot the most suitable route(s), with places of refuge in the event of an unforseen change in circumstances which can alter the original objectives and priorities of the trip.
The SOLAS (Safety of Life at Sea) convention wisely lists the following requirements for a passage plan.
"If one does not know to which port one is sailing, no wind is favorable. "
-Roman philosopher, mid-1st century AD
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