Wave height, period and direction

Reading a wave description starts by distinguishing what each quantity measures. Height describes a vertical dimension; period adds a temporal relationship; direction identifies the represented component and needs the convention used by the product. None of these quantities replaces the others.

The lesson connects terminology to a crest-and-trough schematic and fictional comparisons. It then distinguishes the drawing’s regular curve from variable waves at sea and statistical measures that may appear in a bulletin. The aim is to understand definition and unit before comparing numbers, retaining location, time and information origin.

The wind-waves-and-swell chapter develops local generation and distant propagation. Here we focus on describing those components’ characteristics. An isolated height establishes neither suitable conditions for a vessel nor a voyage choice.