Magnetic declination cancels out. Pretend magnetic north is true north. Walk a mile north, then walk a mile south. The error cancels out perfectly, returning yo

Magnetic declination cancels out. Pretend magnetic north is true north. Walk a mile north, then walk a mile south. The error cancels out perfectly, returning you to your origin. Outside of national parks, the land is usually either featureless or full of roads. Navigating by topological features is thus more of a hobby than a survival need.