The Fishery and Oceanographic Monitoring System (FOMS) or Sistema de Monitoreo Pesquero y Oceanográfico (SiMPO) in Spanish, was recently established in San Matías Gulf (Argentina) with the objective of monitoring fishing fleet operations. FOMS was also conceived as a fundamental tool for supporting research activities in the context of the Ecosystem Approach to Fisheries. A detailed description of the system is offered.