Fits,
Developed for and tested on offshore race boats the SuperSport Series compasses feature the PowerDamp® Plus dial.  This dial technology features the PowerDamp® dial skirt to prevent oscillation, larger DirectiveForce™ magnets for quick lock on and extra-large steel pivots and jewels for smooth fast action.

4 1/2" PowerDamp Plus, High-Visibility Blue Dial with Extra Large White Numerals
Easily Installed, Fits 4.75" (12.06 cm) to 5.125" (13.02 cm)  Mounting Hole. Click here to view a template of the mounting hole (NOTE: Adobe versions may differ;download and print the template Actual size).
Built-in Compensators to Easily Adjust for Deviation
Internal Gimbal Systems for Maximum Stability During Adverse Pitch and Roll Conditions
12V Green LED lighting standard
45 Degree Lubber Lines
100% Repairable