precession magnetometers that can be set up to measure continuously for days or weeks unattended. On Polarstern, two fluxgate three-component magnetometers are mounted on the crow's nest where they continuously [...] software after completing precise circular manouevres at various points during a science cruise. Polarstern also acts as a base for two helicopters, either of which can be set up to tow a Scintrex Caesium