X-Port Tactician#153 Compass. Tactician Features: 3″ CombiDial with Tactical Quadrants show Wind Shifts and Headers, CourseMinder#153 Moveable Bezel & Heading Indicator Locks-In Rhumb or Lay Lines, Forward Lubber Line to Steer Magnetic Courses, Compact 4-1/4″ Base Diameter, Low 2-3/4″ Mounted Height, Easy to Install, mounting template provided, 25 Degree Heel Angle, Twist On/Off for Easy Removal, High-Visibility Blue 3″ dial with Extra Large Numerals, 45 Degree Lubber Lines, 100% Repairable, Exclusive 5-Year Ritchie