しんろ針路shinro
1.
The predetermined path that a vessel or aircraft should follow, as determined by the direction indicated by a compass, often associated with navigation.
2.
The specific angle between the direction of travel of a ship or aircraft and the lines of longitude, guiding their journey.
3.
A broader term referring to the direction one intends to take in various contexts, such as life choices or general progress, indicating the future course of action.