A description is made of the Spanish Harbours tide gauge network (REDMAR), especially focused on the status of the Mediterranean stations. This network consists of 14 acoustic gauges with radio or modem transmission of data to the harbour office, where data is automatically sent twice a day by ftp or mail to the central station in Madrid (Clima Maritimo). This department has also developed an storm surge prediction system, called Nivmar, based in the ocean circulation HAMSOM model (which performs the prediction of the meteorological residuals), and the tide gauge data, which is used both to obtain the astronomical prediction in the harbour and to validate the system.