RYA Coastal Skipper: Secondary Port tidal height corrections 

Studying for my MCA advanced powerboat exam and struggling with secondary ports. Brilliant video helped a lot!!

Informative and concise.

So in the worked example the difference is 2.2 and therefore the height of the tide at the other port is 5.6m……….?

Struggling with that

It's confused because you don't mention that we're setting up a sliding scale between Neap and Springs values. The narrator doesn't use those terms nor MHWS or MHWN. The slides do have NEAP and Spring on them but the learner isn't told their significance. I'm certainly not claiming I could do better....just constructive critique here. This is for when you need to know High Water at a secondary port at times OTHER than bang on neap and bang on Springs. So we're geometrically interpolating intermediate (between Spring & Neap means) times of high water for a secondary port, given HW times of a relative primary port, secondary port differences and using a sliding scale (called a crocodile scale) to plot secondary mid-range HW. Well thats my go at it. It is easier to do than explain. Hope it helps and didn't make it worse.

Not concise enough, images dont relate to what youre explaining, the almanac for example gives us the information to see the differences, the 12 hr tides, e.g 0000- 0600, mhws, mlws, needs more detail! with every step for visual learners