renklint I think what you have works it is just a matter of if it covers you're design requirements. Here is a simple functional design specification (FDS) that would be good to think about when guiding a design like that.

Kayak Compass


Requirements
Visible to pilot


Options
Hard Mounted or Removable?
If hard mount pierce skin of kayak or mount on top?
If removable how to retain….sticker pad, Velcro, magnets, rivets?
Shade requirement to block UV to prevent degradation lens?
If recessed how to remove/prevent water from collecting?