In order to race, each J/70 must have a valid and current J/70 Class Manufacturer's Declaration (MD), which certifies that the boat's weight and major equipment complies with the Class Rules. See CR A.10.
A copy of the MD must be kept with the boat (a digital copy on a phone or tablet is okay). See CR C.5.2(10).
Manufacturer's Declarations are issued and maintained by the J/70 Class Office. See http://j70ica.org/manufacturer-declaration/ for more information.
To search the database of current Manufacturer's Declarations, see http://j70ica.org/master-j70-md-and-weights/
If your boat has not yet been issued a Manufacturer's Declaration, or you have made changes to your boat (for example replaced the engine or added or removed permanently-installed equipment), contact the J/70 Class Office.