The invention relates to a method for determining in a positioning system the position of a receiver andor an accurate system time. Accordingly, a polyester cloth made of the multifilament has a durable deodorizing function, a high strength, and an excellent texture, and thereby is useful for apparel products, medical applications, interior applications, etc. The plant material is from Mammea Americana, Marchantaceae polymorpha, or Callistemon citrinus. Optionally, a thin, flexible substrate material is perforated during the stitching process. The recipes may include different RF power parameters for each respective recipe. In various implementations, the player may obtain substitute content prior to or at the time the player determines to play substitute content.