The Polar Pupil is a new innovative compass, crafted from Gr5 titanium, and features a swingout magnification loupe allowing you to see even the smallest details when needed the The Polar Pupil ...

By contrast, a 'polarity compass', which is used by lobsters and salmon, determines north using the horizontal component of the magnetic field.

So the bees and crabs, whose eyes are sensitive to polarity, have only to look at the sky. It tells them where the sun is; then they steer by the sun, whether they can see it or not.