This is a multi-step answer... Step 1: You must be a member of an SCYA (Southern California Yachting Association) affiliated club. Step 2: You need a Sail Number, not your hull number, unless your class of boat is a One Design Class registered with US Sailing. If you don't have a sail number apply at the SCYA website Step 3: Print the New Member Application, fill it out and mail with a check to PHRF San Diego.
The New Member Application is located under the ABOUT US Tab, Important Documents. If you are unsure as to how to determine the dimensions of your boat or sail contact your Club Handicapper/PHRF Representative. A list of PHRF Representatives is posted under the ABOUT US Tab.
Any modifications that change the structural configuration of the boat and consequently do not allow it to continue as a One Design shall require a new certificate and a new sail number from U S Sailing (modification of the boat but not necessarily modifications of sails).