A line marked on the compass in a ship or aircraft, showing the direction straight ahead.
船首基线，艏方位基线；（飞机罗盘上的）航向标线
Example sentencesExamples
- Adjustable compasses have a compass body with a lubber's line and a rotating capsule or bezel with a boxing mark.
- Simple compasses may use north or 0º on the azimuth circle as a lubber's line.