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Moana automatic temperature and depth profiling system

Moana system

The Moana TD sensor and Deck Unit have been developed as a key part of the Moana project (see below). The system has now been successfully rolled out to over 250 commercial fishing vessels around New Zealand, on boats ranging in size from small in shore day boats to deep water factory trawlers.

The Moana TD sensor is a tough robust accurate sensor that can be quickly and easily attached to a wide range of commercial fishing gear. Once fitted, the sensor operates automatically, recording high accuracy temperature and depth data throughout the fishing event. When the fishing gear surfaces, the data is automatically offloaded to the Deck Unit that is mounted on the vessel

The Deck Unit processes the data and then uploads it to the cloud. The system is fully automatic and so does not interfere with the fishing operation.

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Moana TD sensor

The Moana TD sensor is a small, rugged, accurate temperature and depth sensor that has been designed and engineered to survive the tough operating conditions associated with commercial fishing.

The sensor continuously monitors its own environment, automatically compensating for barometric pressure changes, enabling it to reliably detect the start of a fishing event. During the event, the Moana TD adapts its sampling strategy, switching between profiling mode and time series mode, and applying a passive wave filter in shallow water.

When the fishing gear is lifted out of the water, the Moana TD quickly and automatically offloads its data wirelessly to the Moana Deck Unit.

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Deck Unit

The solar powered Deck Unit automatically offloads data wirelessly from Moana when they surface.

The data is then post processed automatically to geo-position stamp each temperature and depth record, based on the Deck Unit archive of positions.

When the Deck Unit is within cellular coverage, it uploads the data files to a cloud server, or optionally over the vessel WI-Fi network.

The Deck Unit is easy to mount, and once fitted, is fully automatic.

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Technical Specifications


  • Dimensions: 145mm long x 40mm diameter

Temperature specifications

  • Temperature accuracy: Better than +/- 0.05 DegC
  • Operating temperature range: -20 DegC to +35 DegC
  • Temperature resolution: 0.001 DegC
  • Temperature response rate: 1 second time constant
  • Temperature probe: Titanium

Depth specifications

  • Depth rating options: 200m, 1000m
  • Accuracy: +/- 0.5% or less of full scale
  • Resolution: 0.1m
  • Over pressure: 150% of depth rating
  • Pressure sensor: Ceramic


  • Battery life: 2 years
  • Calibration interval: 2 years
  • Data storage capacity: 62,000 records
  • Offload: ZebraTech solar powered Deck Unit


ZebraTech has developed a wide range of hardware to mount and protect the Moana TD on fishing gear. This includes mounting options for:
  • Potting
  • Trawlers
  • Long lining
  • Nets
  • Hand lining
  • Diving
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Trawl door

Moana project

The Moana project is a multi-organisation New Zealand project that was established in 2018 with the objective of improving our understanding of the New Zealand coastal and ocean circulation, connectivity and marine heatwaves, and to provide information that supports sustainable growth of the seafood industry.

As part of the project, ZebraTech developed the Moana TD (named Mangōpare within the Moana project) and Deck Unit that has now been installed on over 250 fishing vessels around New Zealand. These vessels range from small inshore day boats to deep water offshore factory ships.

Every day many thousands of high resolution position based sub-surface water temperature measurements from all around New Zealand are automatically reported into the MetOcean database. The data is then used by both scientists and fisheries for a wide range of vital purposes, such as improved weather forecasting, marine heatwave modelling, optimizing fishing activities and climate change monitoring.

Moana worldwide

In addition to New Zealand, Moana systems are now in use around the world, including Greenland, Louisiana, Maine, France, Holland, Mexico, Australia, Indian Ocean and the Southern Ocean.


To successfully manage such a large fleet of sensors, ZebraTech has developed and operates a sophisticated dashboard that features sensor network monitoring and analysis, with visualizations and alerts.

Please contact us to discuss how the Moana Dashboard can help you manage your fleet of Moana TD sensors.

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