Plastimo Olympic 135 Compass White/Black, w/Binnacle Crisp black card and 5 degree graduations are easy to read. One fore-and-aft line plus four lubberlines for excellent visibility from any angle. Horizontal-read flat cards are slightly dished for improved readability. Spring-mounted directional system for maximum absorption of shock and vibration. Accurate at up to 45 degree of heel. Includes 12V/24V double lighting (2 bulbs)