Where Phuket boat tours depart: Chalong Pier, Royal Phuket Marina, and Ao Po — transfers and which tours use each.
Chalong Pier — most group catamaran and speedboat tours; easy from Kata/Karon/Patong with traffic buffer.
Royal Phuket Marina — premium yachts and some group tours (e.g. HYPE); closer to Laguna/Bang Tao.
Ao Po Grand Marina — east coast; used for some Phang Nga and private charters.
Your voucher lists the exact pier. See tours, yachts, packing list.