Sailors who have RYA Stage 3, and would like to progress their sailing skills in a fun and enjoyable setting can join WYSA.. The season commences with a training day at Aztec Upton Warren. Sailors can join a group to complete RYA Stage 3, which will enable them to join regular weekly sessions after the weekend, or to further develop their seamanship skills.. Saturday afternoon sessions (1.30-4.30pm) commence in April / May and continue until the end of October (excluding school holidays) when sailors can continue to develop their seamanship skills, whilst having fun on the water with friends.