direction of a current; course of a ship
Nautical term referring to the direction a current flows or the heading a ship takes. Often used in navigation contexts.
Steer the ship by reading the direction of the current.
この海域では水先が変わりやすい。
In this sea area, the course of the ship changes easily.
pilotage; pilot
maritime pilot; harbor pilot
maritime pilot; harbor pilot
Compound of 水 (water) and 先 (tip, direction). The exact historical derivation is uncertain, but the term is conventionally associated with nautical navigation.