due north 真北

due north, due south, due east, due west　全て必須単語。文例でわかるが、この単語はおおむね航路、進行方向に関係があるといえる。 33:03 navigation, this is the exec. I want a 180 degree turn. proceed due south, flank speed. due south, all ahead flank. aye sir. 副艦長から操舵へ、反転180度、機関全速。真南へ進路をとれ。全速前進、方位真南、アイサー

Voyage to the bottom of the sea: The return of the phantom

6:52 one badass bee who's been through so much. you understand why her moral compass doesn't point due north.　さんざん地獄を見て来た彼女に、仏心が欠けるのは仕方が無い。

Top 10 Female Celebrities Who Could Kick Your Ass

0:31 the course for the East was set; due north. 東（大阪のこと）への航路はセットされた、真北だ（北極経由で大阪を目指す）

Polar Flight - Anchorage - Special (1969)

0:11 an airplane flying due south has crashed into the upper level of the North Tower of the World Trade Center.

A Look Back at 9/11

参考リンク
http://bridge-english.blogspot.com/2016/01/true-north.html   true north 真北

練習問題解答
a-8749 the sun rises due east and sets due west.
b-0110 due east
b-1480 due west