Format: Dimensions: Overall diameter 110mm. Height 106mm. Apparent diameter of card 90mm.Mini-B Compass. Specially designed for small boats (less than 9 metres (30 ft).The Mini-B combines exclusive attractive features :Good looks of a binnacle mounted compass. No hole in the deck is required : the binnacle is simply secured with 3 screws.The compass cell can be removed instantly with one single twist, for safe keeping when the boat is not in use.