MS Norröna (IMAGE) University of Rhode Island Caption The high-seas ferry MS <i>Norröna</i>, cited in the <i>Nature Communications</i> paper, measures upper ocean currents with an ADCP (acoustic Doppler current profiler) installed in its hull as it makes a weekly roundtrip between Denmark, the Faroe Islands and Iceland. Credit Erik Christensen - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=45707529 Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.