A new direction-finding system is capable of tracking, from coastal stations, the drift of drogues more than 100 km from the shore-line. Frequency-dependent transmitters on light, inexpensive drogues permit as many as fifteen widespread drogues to be monitored quasi-simultaneously, enabling researchers to obtain mesoscale synoptic data at reasonable cost for the first time. Field tests on a moored drogue in Chesapeake Bay and on free-drifting drogues at sea off Barbados show the system to be reliable and accurate.