Discover our real-time acoustic monitoring buoy MOBI
MOBI is a buoy dedicated to real-time monitoring of underwater acoustic sounds. High acoustic performance is available with 24 bits raw data, 110 dB dynamic range, listening up to 200 kHz and self-noise below sea state zero. While recording, an embedded analysis is carried out to allow the real-time transmission of acoustic levels and alerts in the event of a threshold being exceeded. With a long data transmission range without additional subscription costs, energy self-sufficiency and a large storage capacity of up to 16 TB, MOBI is suitable for coastal or deep sea applications, for short missions or long-term PAM (Passive Acoustic Monitoring).
All included affordable buoy!
3 Solar panels, Saint Andrew Cross, 3 Radar reflectors, 3 Flashers, GPS, 3G/4G Module, Hydrophone, Rechargeable battery with charger, Storage, DaViS software, Accessory kit
Key specifications of our acoustic monitoring buoy
✓ Real-time embedded acoustic analysis
✓ Transmission of acoustic levels, alerts or raw data samples
✓ Large data transmission range > 23 km without additional subscription fees
✓ Internal raw data storage up to 16 TB
✓ Energy self-sufficent for long-term deployments
✓ Lightweight but rugged
✓ User-friendly
✓ Easy to transport and to deploy from small boats
✓ Configuration and remote software updates over WiFi or radio link (off-shore)
User-friendly buoy
MOBI has all the user-friendly advantages of the DORI recorder. No cables are needed for the configuration. You can use your smartphone or a laptop to access the configuration directly at sea over WiFi without opening it. To start recording, nothing easier! No cables or magnets are needed, just turn on the switch to REC position. Last recording configuration is automatically used.
MOBI features a lockable, quick and easy access to SD and SIM cards without any contact with the electronics, allowing memory swapping directly at sea.
Acoustics
MOBI buoy benefits from the high acoustic performance of the DORI range of underwater acoustic recorders with 24 bits recording, a dynamic range of 110 dB and a maximum hearing frequency of 200 kHz. The raw acoustic data is stored internally on micro SD cards with a large capacity of up to 16 TB. The target frequency range is divided into two categories:
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- Low Frequency LF, with an HTI-96-MIN Low noise hydrophone: 2 Hz – 30 kHz
- High Frequency HF, with an HTI-99-UHF Low noise hydrophone: 2 Hz – 250 kHz (allows click detection from marine mammals including the harbor porpoise).
MOBI allows listening to any underwater sound, such as biological sounds ranging from shrimp snapping, fish noises to marine mammals vocalizations and clicks, as well as human sounds from ship noises to offshore works. With self-noise below sea state zero and high dynamic range, ambient noise and weather noise can be monitored together with high-level sources.
Field advantages
Easy to transport
The foldable mast makes it a compact buoy for transport with a height of 1.66 m. A specific secured storage location for the hydrophone has been designed in the buoy to avoid any shock during transport. The hydrophone also has its own protective cage.
Easy to deploy
With its lightweight of 54 kg and its handles, the MOBI buoy can be easily deployed by 2 people from a small boat. The 3 lifting points allow easy recovery with a crane.
Maintenance in minutes !
Acoustic analysis
Several types of acoustic analyzes are available on pulsed events and their cumulative noise or on continuous sounds: the estimation of Sound Pressure Level (SPL) or Sound Exposure Level (SEL) following ISO, 2017 standards, Third octave band levels following ANSI/ASA S1.11-2014, M-weighting levels (Southall et al. 2019).
The evaluation of acoustic features and normative thresholds exceedings is in accordance with regulations, in particular European recommendations (MSFD), French recommendations, American regulations (NMFS) and German regulations.
Full technical specifications of MOBI buoy
The table below shows in details the technical specifications of MOBI buoy.
| Functionalities | ||||
| Configuration | WiFi or COM link (off-shore) | |||
| Recording mode | Continuous or duty cycling | |||
| Scheduled mode | Immediate or scheduled start | |||
| Storage | Acoustic data : raw data [.wav] with selectable file duration | |||
| Real-time embedded analysis |
Pulse, continuous and cumulative analyze: SPL, Third octave band levels, M-weighting levels Normative threshold exceeding Marine mammals detection (future option) |
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| Software update | Remote update over WiFi or DATA link (off-shore) | |||
| Localization | GPS included, mooring failure alerts | |||
| Acoustics | ||||
| ADC | 24 Bits |
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| Dynamic range | 110 dB | |||
| Analog gain | 0 dB or 12 dB (Software configurable) | |||
| Analog high pass filter |
10 Hz or 370 Hz (Software configurable) | |||
| Sampling rates | LF : 31.25 kSps, 62.5 kSps, 125 kSps HF : 31.25 kSps, 62.5 kSps, 125 kSps, 250 kSps, 360.36 kSps, 400 kSps |
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| RTC accuracy | 1 ppm | |||
| Power & autonomy | ||||
| Battery | Rechargeable lead battery | |||
| Battery charger | Included | |||
| External sources | 3 solar panels | |||
| Autonomy with solar panels |
Infinite, even in low light conditions | |||
| Complete darkness autonomy |
About 10 days | |||
| Memory (Internal micro SD Card) | ||||
| Maximum storage |
16 TB | |||
| Data transmission | |||
| Link |
COM | DATA | 3G / 4G |
| Frequency | 868 / 915 MHz | 2.4 GHz | – |
| Acoustic data transmitted | |||
| Acoustic features | ✓ | X | ✓ |
| Alerts | ✓ | X | ✓ |
| Raw data samples | X | ✓ | ✓ |
| Range to station |
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| Buoy to shore (alt. 6m) | > 23 km | > 23 km | Depends on location |
| Buoy to boat (alt. 6m) |
11 km | 5 km | |
| Buoy to buoy (used as relay buoys) |
8 km | 3.5 km | X |
| Hydrophone | ||||
| Low frequency [LF] | Hydrophone HTI-96-MIN Low noise Analog bandwidth : 2 Hz – 30 kHz |
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| High frequency [HF] | Hydrophone HTI-99-UHF Low noise Analog bandwidth : 2 Hz – 250 kHz |
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| SH for LF & HF | Standard : -185 dB re 1V/μPa, other on request |
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| Connection | Remote with Subconn connector | |||
| Mechanical | ||||
| Full volume | 100 L | |||
| Diameter | 650 mm | |||
| Folded height | 1.66 m | |||
| Unfolded height | 2.84 m | |||
| Height above water | 2.17 m | |||
| Rugged buoy |
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| Float robustness |
PEHD UV15 foam filled | |||
| Waterproof level |
IP68 extended up to 2.5 m depth | |||
| Marking, visibiliy and safety at sea | Saint Andrew Cross, 3 Radar reflectors and 3 Flashers meeting the IALA standard and visible at 2 NM | |||
| Maintenance | Easy by customer in less than : 5 min (flashers, solar panels, radar reflectors) / 20 min (batteries and mast with antennas) | |||