A medium range system for tracking drifting buoys automatically

The increase in interest in the movement of the top layer of water masses, especially offshore, has led to the realization that there is a gap in presently available measurement techniques. The equipment described has been designed to track transponder buoys from a central base station at distances up to 60km. By using simple design the cost of the buoy transponder has been minimized. Simple changes to the base station allow either range-bearing or range-range tracking to be used.