DGPS drifter

DGPS drifter: View from the Alyce C approaching a DGPS drifter for recovery about 3 km offshore Kahana, Northwest Maui. From left to right on the drifter, the following items are visible: (1) orange bicycle flag and yellow strobe for collision avoidance; (2) orange drifter hull; (3) white DGPS antenna mast with black antenna at top; and (4) black radio antenna with white base, used to transmit position data to shore. This drifter had traveled almost 20 km in the 18 hours after it had been deployed and, at the time of this photograph, was moving north at a speed of 20 to 30 cm/s directly into a wind blowing south at more than 10 m/s.