The symbols have to appear in positions on the horizontal axis mathematically proportional to their duration. They also have to align with other symbols further up and down the page.

The curving flourishes of music notation have always been something a mystery to me, although every day I, like many people, use other arcane symbols without thinking twice about it. The at ...

The EHS-E notation was introduced in the ABS Guide for Dynamic Positioning Systems in October 2021. A copy of the guide can be downloaded here. About Valaris ...