Pilot Charts for Passage Planning
A pilot chart, or atlas, amongst other things, provides a month-by-month, grid-by-grid graphical representation of wind
speed and direction based on historical data. The idea being to enable passage
planning using the probability of favourable wind
speed and direction for different possible routes at different times of the year. It must be emphasized that these charts
are compiled on historical data and the winds actually experienced on a particular route
may be quite different to that shown on the charts. Having said that, they are most useful in planning a route
to give one the best chance of getting favourable conditions, for example, taking advantage of seasonal winds such as the Trades, and many other very predicable winds throughout the world.
Goto NGA Digital Navigation Publications ~ Atlas of Pilot Charts:
These are downloadable, full colour pilot charts. They are fairly big so you will need either a fast link or plenty of time. You can view them online but if you wish to refer to them often it would be much faster to load them onto your own computer and then view them offline at your leisure.