The Colour and Shape of Navigation Marks
Most navigators, even inexperienced ones, learn that colours are important when trying to identify navigation marks at sea. And most people also know that there…
Tag: colours
5 Sea Colours That Are Easy to See
Every time we look out at the sea there are lots of colours. Our brain tends to mash them all up because it is busy…
Fast Recognition and Optical Illusions in Nature
Our brains are pattern-recognising machines. This is true everywhere, but not least in nature, where it honed these skills over millions of years. Bird calls,…
What is a ‘Drying Height’ on a Chart?
The definition of a drying height: “The drying height is the vertical distance of the seabed that is exposed by the tide, above the sea water level at the lowest astronomical tide.” But this…