Assertion: buoy | /r/Synonym | track ocean currents
Facets:
value: at the depth
type: LOCATION
value: whilst collecting surface and subsurface measurements
type: MANNER
Source sentences:
text: Buoys that track surface currents in this way are called Lagrangian drifters and track ocean currents at the depth corresponding to the length of their drogue whilst collecting surface and subsurface measurements.