Drive through the water
The term “ drive through water” (abbreviated as FdW ) indicates the speed of a watercraft relative to the mass of water traveled on. Taking into account the current (displacement of the vehicle due to the current of the water) and drift (displacement of the vehicle due to the influence of the wind), the ground speed results . A drifting vehicle travels over the ground , but not through water . Conversely, a vehicle lying in a current (e.g. a river), which precisely holds its position, travels through water (precisely at the speed of the current ), but does not travel over the ground . When traveling against the current with a suitable drive , the travel through the water is greater, while traveling with the current, less than the travel over the ground . A ship has to make its way through the water so that its rudder is effective and the ship can be steered with it, as the rudder has to be flowed around by the water in order to function.
The journey through the water can be measured with the help of a log , among other things .
The term “ sailing through the water” must not be confused with the term under maritime law in motion . A vehicle is in motion when it is not moored on land , anchored or stuck on the ground . A vehicle that is drifting in the water without propulsion is therefore not traveling through the water , but is still moving .
literature
- Erwin Beckert, Gerhard Breuer: Public maritime law . de Gruyter, Berlin 1991, ISBN 3-11-009655-2 , p. 153 ( limited preview in the Google book search).