The instrument consists of a gridded perspex square on top of which is attached a movable disc, engraved with a compass rose.
Isixhobo sinesikweri ezichaseneyo esigqunywe ngesigqumathelo esibonisayo ngaphezulu apho kudityaniswe nesigcini zinto esihombayo, ezizotywe kumphezulu oqinileyo ngesiseko sesalatha mbombo.