The Galician Tracking Network represents the first attempt to establish a long-term monitoring network of acoustic receivers in NW Spain. This project complement current initiatives in the area, like MOBEIA (see ETN network projects, Alonso-Fernández et al. 2019). The array was established as a result of the international project ATLAZUL (Interreg V-A España Portugal, POCTEP, 2014-2020). The array is composed by 6 fixed stations located along the Galician coast and installed in the platforms managed by the regional meteorological institution METEOGALICIA (https://www.meteogalicia.gal/). All these platforms are equipped with a set of oceanographic sensors (temperature, salinity, etc.). The array uses THELMA Biotel receivers (69 and 71 kHz). This array represents the unique permanent acoustic array deployed in a coastal ecosystems off NW Spain.