Danger line

Under threat status lines understands nautical and the pilotage geometric loci ( LOPs ), beyond which the vessel approaches a dangerous place. Most of the hazard lines run almost parallel to a coast .

As dangers deep lines are usually 10 meters, with a large draft of the ship and 15 or 20 meters. The charts and sailing directions respectively have the coast character and the quality of the seabed surveying possibly to other risk depths down.

Follow the echo sounder carefully while driving ; likewise every discoloration of the water and change of the sea ​​state .
In the vicinity of busy routes in the shallow sea (e.g. the North Sea or the English Channel ), attention should also increasingly be paid to local information and the location of wrecks .

See also: Shallows , Grundsee , estuary , stuck

Hazard lines can also be defined

• by bearings that cannot be exceeded, or
• through minimum distances up to which one can safely approach an object or navigation mark .

The latter can e.g. B. with an e-meter or by observing the vertical danger angle to a well-placed lighthouse . Here the rule of thumb applies: bigger angle - bigger risk!

See also: cliff , reef , sandbar

literature

• H. Birr, S. Kuschinsky, L. Uhlig: Terrestrial Navigation . Navigation Guide, Volume I, Transpress VEB Verlag für Bauwesen, Berlin 1968.