Resumo em Inglês:

ABSTRACT This article presents a real-time drifter tracking system designed to investigate circulation and transport processes in coastal environments. Field demonstrations were conducted in two contrasting Brazilian coastal regions: Florianópolis Island in the south, a microtidal area driven primarily by wind circulation, and São Marcos Bay in the northeast, an estuary complex characterized by strong tidal forcing. Surface Velocity Program (SVP) drifters were adapted for coastal applications, incorporating a reel to adjust drogue depth and electronic systems housed in a 3D-printed enclosure. The tracking system was also tested with an undrogued iSphere drifter to assess estuarine surface circulation. Satellite communication systems enabled real-time tracking for efficient deployment and recovery of drifters, while optional fast-response loggers ensured near-continuous data collection. Results revealed rapid circulation responses to wind forcing north of Florianópolis Island, and a tidal-dominated environment in São Marcos Bay, with secondary influence from wind and waves. The real-time tracking system prevented equipment loss and enhanced data acquisition. This reusable drifter setup offers a practical solution for oceanographic studies, supporting repeated deployments, streamlined data collection, and adaptability to various coastal applications and drifter types.