For club races, HYC does not require PHRF certificates. If you have a PHRF certificate from YRA-LIS, that's great, we'll use that. If you don't, no problem. We'll compute a provisional rating for you starting with the YRA-LIS base rating for your boat type and applying some standard adjustments for your headsail, prop, etc. Note that for many boats, YRA publishes different base ratings for spinnarker vs. non-spinnarker, and also for windward-leeward vs. distance courses.
The HYC rating database is attached. Contact the race chairman (firstname.lastname@example.org if you make any changes to your boat which might affect your rating.