The second new arrival on the commercial market is the Motion Reference Unit
MRU.. The MRU, which is also manufactured by Seatex, can be set up to provide time
series both for directional measurements in the Wavescan buoy i.e., heave, pitch and
roll. and in the Seawatch buoy heave and displacement.. This sensor has a number of
practical advantages including small size, low weight and the fact that it is not sensitive
to rapid rotation under transport or to low temperatures, unlike the Datawell sensors..