“Easy Plot and Know the Point of Sail”


Ø      First find the wind direction from the Ships Compass when raising the main sail.  Confirm it with the weather report you obtained from the weather service.  Rotate the wheel to the wind direction on the Compass Rose.


Ø      Wind directions are magnetic and are the direction from which the wind is coming.  To calculate the wind directions relative to True North add/subtract Variation.  Wind speeds are given in knots.


Ø      When you have established the wind direction, Dial A Sail will show the Point of Sail you want to obtain and give the compass degrees necessary to steer to be on that Tack and point of Sail.  Adjust the sails for this point of sail.


Ø      It provides the compass degrees for each point of sail on Port or Starboard Tack.  Knowing the point of sail provides the knowledge for sail trim.


Ø      Dial-A-Sail will provide the running degrees of the danger area to prevent accidental jibbing.


Ø      Compare the heading you want to steer with the Dial-A-Sail, to know what tack and point of sail you will have to be on and the tacks necessary to maintain your rhumb line.  Dial A Sail makes it easy to plan you sail from home using the current weather report.


Ø      If the rhumb line course is in the “no-sail-zone” it will show the tacks necessary to reach your destination.


Ø       Apparent wind is a combination of the true wind plus boat speed.  Sails are trimmed to the Apparent wind, but boat performance is best with reference to the true wind.


Ø      Improve teamwork between the helmsman and the sail trimmers to adjust sail trim to achieve maximum boat speed on each heading.


Captain Bob
Boat Instructions Power/Sail
The Coadjutor For Safety-Navigation-Seamanship-

Maintenance-Boat Handling

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Point of Sail/True Plotter

Dial A Sail Unit
Easy True Plotter
The two products offered by the Dial-A-Sail.org Comapny are highly recommended for all leveles of Seamanship. .
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