A composition for treating or cleaning fabric articles, especially articles of clothing, linen and drapery, wherein the composition comprises a lipophilic fluid, a polyalkyleneoxide polysiloxane surfactant, and a second surfactant. Data wipeoff using predicted future navigation data reduces or eliminates incomplete data wipeoff, thereby enhancing GPS receiver sensitivity and reducing acquisition times. An endless drive having a tensioning rail of the type disclosed is also provided. A temperature compensated Fiber Bragg Grating interferometer can be in optical communication with the optical fiber.