01
The idea
In use, the compass is fast. Four questions, in order, taking under a minute once the habit is in: what is true, what do I owe, what am I avoiding, where is the line. The order matters — starting with courage produces bravado, and starting with temperance produces paralysis.
Apparent conflicts between virtues are common and are usually diagnostic. When courage and justice seem to pull opposite ways, one of them is almost always being run wrong: "courage" that requires humiliating someone is not courage, and "justice" that requires you to stay silent is usually comfort with a better name.
The genuinely hard cases are real, and the tradition does not pretend otherwise. The compass does not remove them. What it does is guarantee that you have looked at all four faces of the decision before you commit, which is more than most decisions get.
02
Why this matters
A decision procedure you can actually run under pressure is worth more than a better one you cannot. This one is four questions and fits on a card.
It also converts vague moral discomfort into a locatable problem. "Something about this feels wrong" is unactionable; "this fails the justice question" tells you what to change.
And it catches the specific failure this whole department is designed to prevent: a technically excellent, perfectly composed decision that is quietly self-serving.