正北的用法和樣例：
例句
-
我們是朝正北方向航行。
Our course was straight to the north. -
東北水手羅盤上的方向或點，在正北與正東中間，或正北偏東45度
The direction or point on the mariner's compass halfway between due north and due east, or45= east of due north. -
西航海者指南針上的基本方向，即從正北按順時針方向轉270度，正對著東方
The cardinal point on the mariner's compass270= clockwise from due north and directly opposite east. -
這條船的航行方向是正北。
The course of the ship was due north.
