Secondary Port Calculation Form
Almanacs give full tide tables for standard ports (such as Dover) and secondary port differences to enable times and heights to be calculated. This simple graphic method shows how easy Secondary Port calculations can be.
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.
A4 laminated sheet