Nuyina is equipped with two Acoustic Doppler Current Profilers (ADCPs): A hull-mounted Teledyne Ocean Surveyor 38kHz (OS38, 16-1800m), and a drop keel-mounted Teledyne Ocean Surveyor 150kHz (OS150, 8-800m).

ADCPs measure water column current speed and direction by transmitting acoustic pulses and calculating the Doppler shift from suspended particles.

The hull-mounted system can operate continuously while underway, while the drop keel system may be restricted by sea ice, sea state, and other operational constraints.

The AAD standard settings for opportunistic and transit acquisition are as follows:

System	OS38	OS150
Ping type	Narrow band	Narrow band
Bin size	24 metres	8 metres
Number of bins	65	65
Time between ensemble	2 seconds	1 second
Short term average	60 seconds	60 seconds
Long term average	300 seconds	300 seconds

Marine Facilities Planning

Instruments and Facilities

Marine Facilities Planning