Ytunnukset

Ytunnukset is a Finnish term that refers to natural navigation marks on the shoreline, typically formed by the scattering of waves against rocks, cliffs, or other coastal features. These marks are also known as "natural pile kazeta" or "pile kazeta" in some coastal areas.

Ytunnukset can be a unique combination of colors, shapes, and patterns, often seen as stripes or lighter patches on the shoreline. They can be stable or changing, depending on the conditions of the shoreline. These markings are usually not visible from a distance but become apparent when sailing or kayaking close to the shore.

The appearance of YTunnukset is due mainly to the actions of sea waves. These marks are particularly evident in areas where there is erosion of the shoreline, and the rocks or cliffs are breaking down into smaller particles. The rhythmic pounding of the waves distributes these particles at a particular altitude, resulting in the characteristic "bar pattern" seen in YTunnukset.

The YTunnukset are natural signs that can help mariners identify the position of their shore or even the location of small islands close to them. They are valuable navigational aids, especially in situations where the coastline is not easy to distinguish clearly. YTunnukset have been a part of sailors' knowledge and experience since ancient times, being an intuitive guide that many sailors still utilize in their daily routines.