Secondary Port Calculations are easier than you think! Despite it being one of the main problem areas on RYA courses.
Using a simple graphic method this handy guide shows just how simple Secondary Port calculations can be. This A4 encapsulated template sheet will make life so much easier.
Side one explains how the information that you need is laid out in almanacs and the Admiralty Tide Tables and what that information means. It then shows a worked example for Time Differences. Side two shows a worked example of Height Differences.
Side two also has plenty of space for your own calculations.
For a detailed explanation of how Secondary Port Calculations work click here.
This product and others from our Cockpit Card series are available on the RYA website.
Fully waterproof, the matt encapsulation also means that a soft 2B pencil may be used directly on the surface.