Q. How did the Vikings navigate?
Q. Is the earth's magnetic field the same all over the world?
A. No. It varies depending on the quantity of iron in the earth's crust at different locations.
Q. How do homing pigeons navigate?
A. Pigeons navigate by listening to infra-sound (the low frequency sound of waves on a beach and wind around mountains), by sunlight, and by a tiny magnet in their brains which detects the earth's magnetic field.