Historical information

True North is at the centre of the north pole This is a fixed point at the top of the planet. The majority of our navigational charts are orientated so that they use true north as their reference point. This is because true north doesn’t move. Magnets don’t point towards true north however. They point toward magnetic north which is in a different geographical place. The difference in the angle between true north and magnetic north is call variation.

Physical description

Three wooden boxes containing magnetic compass quadrantal correctors, correcting magnets and shadow pins.

Inscriptions & markings

Saura Keiki Seisakusho Co Ltd