Since the original part accidentally broke on our boat, I gave it a try and designed a replacement compass mounting pad in Autodesk Fusion 360.

The mounting plate is for a Plastimo Offshore 105 compass, the original bracket replacement is Plastimo's partnumber 17268.
http://ecat.plastimo.com/EN2015/common/data/0323.pdf

I successfully printed one instance of it on an Ultimaker 2 in the Paja maker space in Espoo city's library in Iso Omena. This copy is installed and working fine.

Plastimo is a registered trademark of Navimo Group