There is a new Velocitek compass, called the Shift: http://www.velocitek.com/shift/
Essentially it is an electronic compass which stores reference angles on both tacks to provide a lift/knock indicator (like the Tacktick Race Master except reference angles are stored by pushing a button).
Are these class legal? They don’t have a GPS so I would assume yes, but it would be nice to get an official word.
Cheers,
Michael (1653)