Instruments that are deployed on the ONC observatories that are of concern to the Royal Canadian Navy (RCN) and US Navy (USN) are called Tier 1 instruments. Currently, two three types of instruments fall into this category:
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Passive acoustic instruments
- Hydrophones
Magnetometers
The RCN and USN have the ability to control (divert) the realtime data flow from the Tier 1 instruments to the ONC data archive.
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On the offshore observatory (formerly NEPTUNE) and inshore observatories (formerly VENUS), the raw acoustic data stream is subject to diverts, while the low resolution FFT data stream is not. Near-shore observatories are in general not subject to diverts. Diverted raw acoustic data may be returned to ONC if the navies determine there is nothing of concern in the data.
Magnetometers
The first magnetometer will be installed in 2025. While this magnetometer (LEMI-089) will be subject diverts, the details of this are still to be worked out.
Historical Hydrophones
Naxys
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