Abstract: A computer implemented method of monitoring the cleanliness of an underwater surface of a stationary object. The method is performed on a computing device and comprises: retrieving environmental data from memory of the computing device, the environmental data associated with environment conditions of the stationary object; determining a fouling value indicative of a level of fouling that the surface is exposed to based on at least the environmental data; determining a fouling protection value defining a tolerance to fouling associated with a surface of the stationary object; and identifying a level of risk of fouling on the surface of the stationary object by determining a fouling risk value using the fouling protection value and the fouling value.

Abstract: A computer implemented method of dynamically monitoring the cleanliness of a hull of a vessel during a journey of said vessel. The method is performed on a computing device and comprises: retrieving environmental data from memory of the computing device, the environmental data associated with environment conditions of the vessel; determining a fouling protection value defining a tolerance to fouling associated with a surface of the vessel; and identifying a level of risk of fouling on the surface of the vessel based on the fouling protection value and the environment conditions.