The guppy zone defines where I can find and leave a guppy. In other words, these are the areas where I can start and end the rental of a vehicle. In addition, within the guppy zone you do not have to pay for parking in the blue zone.
Specifically, in Gijón, you can park freely in most of the urban area of Gijón and in other areas of interest such as the Hospital de Cabueñes and the parking lot of the Parque Tecnológico de Gijón, in La Laboral.