the.com/true north

means The fixed geographic point of the North Pole—or, in everyday use, the core value or purpose that guides your decisions when everything else is in flux.

from A navigator's term born from the gap between two different 'norths': magnetic north, where a compass needle actually points, and true north, the fixed geographic pole on maps, unmoved by the earth's shifting magnetic field. Sailors and surveyors needed the distinction because the compass lies a little, depending on where you stand. By the 20th century the phrase had drifted ashore into metaphor, used for the unshifting principle or purpose a person navigates by — a sense now so common it's arguably the word's primary job.