🧭 Magnetic Navigation

B field intensity: 50 µT Inclination angle: 60° Wind drift: 0° Breeding location (latitude °N): 55 Wintering location (latitude °N): 5

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Nav accuracy—

Energy cost vs direct—

Compass error—

Radical-pair rate—

Cryptochrome Compass
Radical-pair singlet/triplet interconversion rate depends on B field intensity and direction. Inclination (not polarity) provides the compass axis — birds can't distinguish N from S but sense the angle between B and gravity.