Secondary Port Calculations are easier than you think! Despite it being one of the main problem areas on RYA courses.
This simple graphic method shows how simple it can be. This A4 encapsulated sheet will make life so much easier.
Side one explains how the information that you need is laid out and what that information means. It then shows a worked example of Time Differences and side two has 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.
Matt encapsulation means that a 2B pencil may be used directly on the surface.