The challenge

Operations in deep and ultra-deep water (6,000 to 10,000 feet) are challenging for drilling, construction and pipeline installation. These challenges can be made safer and more efficient through a good understanding of subsurface current patterns. For this to be effective, wireless transmission of observations to the surface are essential for instant analysis.

This type of data is usually obtained using acoustic Doppler current profilers (ADCPs) mounted near the surface looking down through the water column. As operational depths increase, a second ADCP, placed on the seabed looking-up, provides the additional data.

The most common approach involves deploying the second ADCP for several months at a time. This is set to log bottom currents at intervals from minutes to hours. While this data is extremely useful for site surveys and planning exploration activities, the delay between collection, instrument recovery, download and analysis, means its usefulness is limited. Particularly when needed for supporting on-site decision making during operations (including complying with government directives). A faster way to retrieve the data collected by the ADCP is needed.

The solution

An acoustic modem directly connected to the ADCP provides a cost-effective and increasingly popular option for providing instant access to the data collected. The modem enables access to the data from almost anywhere in the world.

But not all acoustic modems are made equal. It’s vital to make sure when choosing one for use in an application such as offshore drilling, the signal processing and error correction techniques reliably deliver critical data payloads over long distances and, if needed, through acoustically hostile transmission paths.

RPS Ocean Science identified Sonardyne’s 6G (sixth generation) wireless communications platform as the optimum solution. 6G has an enviable reputation across the region. Today it’s the only acoustic technology to have been proven as a successful monitoring solution during a well containment situation.

The seabed component of the monitoring system incorporated a Sonardyne Compatt 6 telemetry transponder interfaced with a Teledyne RDI Workhorse 300 kHz ADCP. These were mounted together in a deployment frame. 10,000 feet above, a Sonardyne HPT modem deployed from the rig acted as the surface receiver. It was enclosed within a rugged cage to protect it during deployment and recovery phases, and weighted to prevent drifting in high surface currents.

The HPT was integrated with the data collection system RPS Ocean Science had previously supplied to the rig, this included a 38 kHz ADCP at the surface and load handling system. The Compatt 6G modems and ADCP were deployed by ROV on the seabed at a depth of 9,970 feet, approximately 150 feet away from the rig’s BOP.

After establishing reliable seabed to surface communications, data collection was initiated. The acquisition system is designed to receive and display data from the surface and bottom ADCPs at 10 minute intervals.

The results

Following initial system deployment, the signal analysis tools built into the Compatt 6 and HPT enabled the bidirectional communications link to be optimised for the local conditions. This resulted in highly reliable and low latency data return rates.

Water velocity profiles were generated from approximately three metres to 100 m off the seabed. The profiles were composed of 50, two metre bins. Data was averaged over 75 seconds at a 1 Hz sample rate. Velocity and direction profiles were processed by the subsurface instrument and transmitted to the rig’s data acquisition system where profiles were displayed, along with the velocity and direction profiles from the surface ADCP, on the platform bridge.

The data has been utilised by the metocean team to support exploration operations in daily advisories as well as providing a unique perspective on potential Topographic Rossby Waves thought to be a common feature in the area. Processed data files were also transmitted to our client’s shore-based server and the National Data Buoy Center (NDBC) in near real-time.

A demonstration of the system’s capability took place during the summer of 2015. Since then, the RPS-Sonardyne solution has proven to offer reliable self-contained operation with long service intervals. The configuration of the upward looking ADCP and Sonardyne 6G digital modem technology perfectly complements conventional near-surface and mid-column current monitoring. It also contributes toward lowering operational risk and increasing the safety of drilling, survey and ROV operations in deep water.

The challenge

Understanding how carbon dioxide behaves in deep water environments requires specialist equipment and multiple sensors. The various systems need to be able to work together smoothly, fly through the water without drag and reliably stay in contact with above water instrumentation.

One of the NOC’s most recent missions focused on CCS. As part of the European Union Horizon 2020-funded Strategies for Environmental Monitoring of Marine CCS (STEMM-CCS), it focused on CCS in the North Sea.

The solution

The project, involving researchers from Germany, Norway, Austria and the UK, and industry partner Shell, centred on the decommissioned Goldeneye field, about 100 km offshore Scotland in about 120 m water depth. In May 2019, researchers and scientists onboard the RRS James Cook set out for Goldeneye for an intense period of scientific activity.

The aim was to simulate carbon dioxide (CO₂) leaks from the seafloor in order to test various sensors and systems for their ability to detect potential CO₂ leakages. This would help the teams understand how the gas behaves, and discover if seepage from the seabed worked its way up through the water column.

For mapping the area and wide-area chemical sensing, they used a Gavia autonomous underwater vehicle (AUV) called Freya. Because the Gavia had been adapted specifically for the mission – including fitting additional sensors to its body – operators were uncertain about how it would now fly through the water.

Our Ranger 2 system has underpinned the ocean science carried out by the RRS James Cook since it went into NOC service in 2006. It’s helped to track a whole host of vehicles and instruments, including NOC’s Isis ROV to 5,000 m deep. Indeed, on this latest mission, Isis, with a 6G Wideband Mini Transponder (WMT) onboard, was tracked using Ranger 2 during its many trips to the seafloor where it helped to accurately install an array of seabed equipment, sensors and instrumentation.

The Gavia Freya is classed as a low-logistics vehicle – meaning that only two people are required to deploy and recover it. Typically, Gavias measure anywhere between 1.8 m and 4.5 m in length, and just 200 mm in diameter. So when it came to choosing which USBL transponder to equip Freya with, there was really only one option Nano.

It’s our smallest 6G-enabled USBL transponder (just 160 mm tall by 52 mm diameter) and comes with features such as wireless charging, depth sensor and lightweight plastic construction. For this mission, Freya’s mission payload included a GeoSwath system for side scan sonar and bathymetry, mounted externally to the hull, supported by additional buoyancy. This provided a convenient place to the site the Nano. Freya was also used for photographic surveys and chemical sensing for pH using the SeaFET system.

For maximum operational flexibility, the RSS James Cook is permanently fitted with both our HPT 5000 (wide area) and HPT 7000 (deep water optimised) transceivers to separate, through-hull deployment spars. Whilst either of these medium frequency transceivers is capable of tracking a Nano, the shallow water at Goldeneye meant that the Gavia was tracked with the HPT 5000.

The results

“We were able to use the displays from the Ranger 2 to see that the Gavia was getting down to its working depth, usually around 100 m, as we were mapping the seabed,” says Mike Smart, Glider Engineer, Marine Autonomous and Robotic Systems, National Marine Facilities, NOC. “This was very useful as there was quite a lot of uncertainty about how the Gavia would behave given the extra payload it was carrying. Tracking data from Ranger was also shared across our network with survey and science teams elsewhere onboard.

“Being able to track the progress of the mission was another nice feature. With a much longer and heavier configuration of Gavia than we usually deploy, the time it needed to resurface was longer than we had predicted. So, being able to view the vehicle’s precise location, aided by regular depth updates from the Nano, meant we could more accurately predict surface times and not be anxiously waiting for Freya to reappear at the end of her survey run.”

This is just the latest time we’ve been involved in the work towards CCS. Past work demonstrates how our Sentry leak detection sonar and our Solstice side scan sonar are able to detect leaks, as static and dynamic sensors. Our instruments have also been shown to be able to support so-called chemical “sniffers” that can detect CO₂ (see Baselines 12 and 18).

While it’s still an emerging area, the industry is getting closer to making CCS offshore a reality – the first offshore carbon storage license was awarded in the UK in 2018, followed by a new license for a significant storage site in Norway in 2019.

Speak with one of our experts to learn how we can make your CCS project a success.

The challenge

Port Phillip Bay is home to a host of unique and iconic marine life and is one of the most diverse places on the planet for seaweeds and reef systems that support a diverse array of sponges and other invertebrates. It’s also shadowed by the city of Melbourne which has a growing population of nearly 5 million people and experiences particularly challenging conditions – the large embayment is exposed to strong winds and has periods of low underwater visibility.

To protect the Bay, the Victorian Department of Environment, Land, Water and Planning (DELWP) is implementing the Port Phillip Bay Environmental Management Plan 2017-2027 (EMP). The team at Fathom Pacific Pty Ltd have been tasked with carrying out studies and surveys in Port Phillip Bay to inform the decisions and recommendations made by the EMP.

To do this they need to create reliable models and maps, along with reports detailing the bay’s marine biotopes – areas that provide habitats for specific species – for the protection of the Bay to be effective. The data gathered has to be quantitative and accurately geo-referenced, and it must be gathered in increasingly cost-efficient ways.

The solution

Firsthand ecological research and environmental monitoring are key building blocks of the models and maps needed for supporting the EMP decisions. The BlueROV2 remotely operated vehicle (ROV) from Blue Robotics and a Micro-Ranger 2 USBL from Sonardyne have enabled Fathom Pacific Ltd to capture incredibly detailed HD imagery from the camera they’ve mounted on it. Importantly, the USBL tells them exactly where it was recorded. If divers and other assets are in the water, it can track them as well.

The Micro-Ranger 2 is extremely portable and easy to mobilise making it the ideal solution for small-boat coastal operations and short-notice surveys.

The MRT – the part of the system that communicates with transponders fitted to underwater targets – is so small and light, it has been mounted to the bottom of the stern diver ladder. The range and coverage of the transponder is impressive. Equally impressive are the Nano transponders, these can be strapped to the frame of the ROV or a diver’s tank without affecting balance or freedom of movement. The rechargeable battery lasts for a full day of operations.

Thanks to the instructional videos available on YouTube, the whole system was simple to install and calibrate. Once the software was set up and tested on the laptop, it was put straight to work supporting surveys throughout last winter and spring. The whole set up was often mobilised at very short notice, due to the unpredictable weather windows experienced in Port Phillip Bay.

The Micro-Ranger 2 system has accurately and consistently tracked the BlueROV2 in the bay’s shallow waters, even when it has been transecting some 50-100 m from the small MRT transceiver. This is important for the assessment of the bay’s biotopes during which images of the key structural and functional components of temperate reef and sediment biotopes are taken using the ROV mounted HD camera.

ROV transects typically operate in two modes. The first is a ‘video inspection mode’, detailing the canopy, sub-canopy, lower strata and turfing components and identifying the associated macrofaunal biodiversity. The second is a ‘still image mosaicking mode’, where fixed-altitude planar stills are taken to create biotope mosaics.

Using Micro-Ranger 2, Fathom Pacific Ltd were also able to place their analyses of reef biodiversity and biotopes into a spatial context by correlating the imagery data with real world coordinates. This means ground-truth data for biotope modelling can be provided, while also establishing biotope conditions and informing ecosystem models. Exactly the same locations can be visited time and again for future surveys.

The challenge

Detecting divers effectively was no easy feat. Navy labs had been developing and fielding large, heavy sonars that were seeking to protect naval ports. It was quickly apparent that costly mobilisation and maintenance operations made them unsuitable for permanent deployments.

Weighing at approximately 250 kg, they proved difficult to transport and almost impossible to deploy from vessels of opportunity.

Fast forward to today, a new cold war is brewing. Peer adversaries are developing new capabilities and adding to the list of threats. Combat-divers remain a significant threat to assets and sailors. The recent attacks on the port of Fujairah are a clear example of what can happen when the guard is let down. Now, unmanned underwater vehicle (UUV) systems have also evolved alongside this threat. UUVs have a smaller signature than divers and can move faster.

The solution

A new approach was required and so Sentinel was born. Sentinel was the first intruder detection system designed to be portable. It weighs just 35 kg. Design parameters were carefully selected to improve the detection and tracking capabilities in comparison to existing systems.

Typically deployed in shallow waters and with a requirement to detect threats as far as possible, the design carefully considered the challenges from operating in confined areas, such as complex sound velocity profiles, multipath effects and shadow zones. As a result, Sentinel uses a circular transducer configuration to ensure even coverage.

Modern computing and cutting-edge algorithms enable Sentinel to track and analyse a large volume of targets. Improvements were made without compromising performance. Sentinel’s range and detection rates were far superior to that of the larger systems. Its size made it truly expeditionary. The system could be mobilised to set up a protective perimeter for your amphibious forces one day or to monitor a sensitive choke point the next.

As new threats emerge, our navy customers want to ensure that their existing Sentinel systems can meet them. After all, the design parameters were carefully selected to improve the detection and tracking of divers. Can they meet the underwater drone challenge?

Each sonar head was designed to operate at 70 kHz with a 40 ms pulse to improve the signal-to-noise performance and to increase the effective range of the system. The 20 kHz bandwidth provided an effective 3.75 cm range resolution. Sentinel emits a 360° linear-period-modulated (LPM) pulse and uses 256 receive beams equally spaced along its perimeter to discriminate targets in up to 1500 m range even at high velocity.

The results mean Sentinel can detect scuba divers up to 1,000 m range and divers with rebreathers up to 700 m. Sonardyne engineers had the anecdotal experience that the system could detect and track UUVs, but more concrete data was needed to ensure that performance was suitable for the task.

A set of experiments conducted during the Advanced Naval Technology Exercise (ANTX 2019) in collaboration with the US Naval Undersea Warfare Center (NUWC) in Newport, RI demonstrated improved performance using Sentinel against combat divers and a one-man portable Riptide µUUV.

ANTX has become a key naval technology collaboration, development and demonstration event in the US calendar. It brings together more than 1,000 naval, academic and industry attendees at the US Naval Undersea Warfare Center’s (NUWC) Narragansett Bay Test Facility (NBTF) in Newport. The NBTF is a test and evaluation facility designed to support research and development work in advanced underwater weapons and weapons systems, weapon launchers, UUVs and oceanographic equipment.

The Riptide µUUV provided a formidable target. Manufactured by BAE Systems, the Riptide is just 12.4 cm in diameter and weighs under 12kg. The man-portable small, unmanned vehicle is a sophisticated yet simple, efficient, and highly flexible platform.

In the exercise, multiple threat runs using both divers and the µUUV were carried out against Sentinel over two days. In some cases, the runs used threat tactics, such as moving along harbour walls and zig-zagging courses, designed to make tracking as challenging as possible. The results demonstrated that Sentinel continues to be up to the task.

That same year, the Slovenian Armed Forces (SAF) 430th Naval Division put our Sentinel through its paces in their own test. As part of a broader multinational exercise, their Underwater Special Operations Detachment carried out operations alongside a group of divers from the Montenegrin Navy.

The 430th Naval Division of Slovenia’s Armed Forces often use their Sentinel from vessels in port, while at anchor. For the multinational exercises, they deployed it from a pole mount from the patrol boat stern platform. Starting with integration drills, involving underwater and surface inspection of the operational area, they moved on to joint inspection of navigable waterways, followed by a mine hunting and detection exercise around moorings used by allied vessels.

Throughout, the underwater part of the port’s disembarkation area – which is protected by the 430th Naval Division – was monitored using Sentinel. It was then used to steer the force reaction towards the simulated intruders.

The results

The Sentinel Expeditionary System is perfect for short term operations using Offshore Patrol Vessels (OPVs) and temporary sites onshore. Navies use it as part of naval exercises, to provide protection at specific events such as during the Olympics, or protect their expeditionary forces where they are operating.

Both the ANTX experiments and the 430th Naval Division’s use of Sentinel shows its flexibility – it can be deployed and redeployed from different vessels, quaysides, subsea mount frames or even buoys. In other words, our Expeditionary Sentinel System provides intruder detection where it’s needed.

Our navy customers also want to know how to optimise the system for each new environment. The performance of any sonar system is heavily dependent on the target of interest and the environment the system is being operated in. Fortunately, Sonardyne has developed performance prediction tools. These determine the performance of the system in different environments against different types of threats. The tools consider deployment options and provide effective metrics to your team.

With sufficient time a site survey informs the user where to deploy sonars to improve the performance of Sentinel. These surveys can also be conducted remotely. Our training includes how to operate these tools meaning that our customers can conduct those surveys and remain at arm’s length from our support teams.

Most navies still consider Sentinel to be the intruder detection of choice. They need a system they can count on and that will stand up to emerging threats. These threats exist now. Equipped with a Sentinel Expeditionary System, a two-person team can rapidly mobilise on-site, use the output from the site survey to deploy the Sentinel and keep a constant vigil. Any threats will raise the alarm. This data can be interfaced with a third-party command-and-control system if required.

The challenge

Uncrewed systems are the preferred choice for navies in support of mine countermeasure (MCM) operations. The first navy to deploy these operationally was the US in Operation Iraqi Freedom. Here an early version of the Mk 18 Mod 1 “Swordfish” underwater vehicle was used in support of mine clearance operations.

Since then, many navies have acquired small, man-portable systems to conduct operations in very shallow waters and larger systems for operations in deeper waters. The performance of the Royal Australian Navy’s Bluefin-9 and the medium-sized Bluefin-12 unmanned underwater vehicles (UUVs) has demonstrated that ocean robots have a significant role to play in MCM missions.

These kinds of underwater vehicles succeed because they provide a stable platform in which to mount payload sensors and do a great job of surveying the seafloor, at a constant height from the sea bottom. However, while operating, their data is stored within the system until it can be recovered and the data uploaded to a computer. This leads to delays in completing the operation. One way to combat this is to use uncrewed surface vessels (USVs) to complement their underwater cousins. This enables real-time access to data and facilitates a faster tempo for operations. Just like the underwater vehicles, to be successful a USV needs to provide a stable platform for its payloads and get them close to the seafloor.

The results

The critical advantage that Equinox offers over competing systems is that it is made from combining products that retail as COTS. This means its component parts have been deployed in thousands of mobilisations and have been proven, time and again, to meet or reduce error margins.

Equinox selects best of breed COTS to deliver a step up in capability. The result is improved performance compared to standard side-scan sonar systems, improved navigation accuracy several times better than any other system in the public domain, and at a price exceedingly lower than competing products that have been specifically designed to conduct mine-hunting operations.

For a navy this means an enhanced ability to mobilise a capability quickly, using components that can be easily looked after and maintained and feeding into existing training programmes and a community of existing users.

The solution

The catastrophic 2004 Indian Ocean Tsunami led Sonardyne’s founder, John Partridge, to initiate development of a variant of the Compatt 5 seabed transponder to detect a Tsunami passing overhead.

With an extensive track record in the oil and gas industry, this instrument was ideal to form the heart of a TDS requiring very high reliability. Nevertheless, integration of a Digiquartz pressure sensor to enable the Compatt 5 as a BPR, required significant development. This particularly involved reduction of the power required for continuous operation on battery power. Similarly, a new transceiver with low quiescent power, capable of long endurance deployment on a surface telemetry buoy, also had to be developed.

Development was so rapid that when India’s National Institute of Ocean Technology (NIOT) in Chennai, started looking for a TDS in 2005, it was ready for competitive field trial. Sonardyne’s solution was subsequently selected in 2006, leading to deployment of operational systems in the Bay of Bengal and Arabian Sea in 2007.

In normal operation the Digiquartz pressure sensor in the BPR continuously measures water pressure and this data is stored every 15 seconds. The pressure data is then acoustically transmitted every hour to the surface, where an acoustically baffled transceiver, mounted beneath a buoy, receives this data. The buoy is linked to NIOT’s Mission Control Centre (MCC) by satellite communications, so that not only can data be transmitted ashore quickly, but also the health of the BPR is remotely monitored and, if necessary, reconfigured.

Embedded in the BPR is the National Oceanic and Atmospheric Administration’s (NOAA) Tsunami detection algorithm, which compares each measurement to the predicted pressure [Figure]. This predicted pressure uses the previous 3-hour history to take account of tide, weather and temperature variation. Should the difference between the two exceed a programmable default threshold of 3 cm for two consecutive samples, the BPR switches into Tsunami Alert Mode, which then initiates a sequence of data transmissions for the next few hours.

Sonardyne’s Wideband acoustics are central to the functioning of the system, and with the subsequent replacement of the Compatt 5 with Compatt 6, Sonardyne’s latest TDS offering is equipped with the most robust and efficient wideband acoustic telemetry available.

The results

Soon after the first batch of BPRs were deployed, on the 12^th September 2007, the system detected its first Tsunami, which was triggered by an 8.2 magnitude event off the coast of Sumatra at 04° 30’ S 101° 18’ E. How the Tsunami generated was tracked across three of the Indian Tsunami Buoys (ITB) is shown in the gallery.

Located between 1,760 – 2,300 km away, all three stations recorded the seismic ground wave arrival between 7 – 12 mins after the event started. Between 2 – 3 hrs later, the wave itself, which was less than 10 cm in height, passed over the three BPRs, indicating that it had travelled at between 740 – 800 km/h over this period.

Today, Sonardyne’s TDS continues to deliver bottom pressure and event data to NIOT, which is responsible for delivering sea-level data to the Indian Tsunami Early Warning Center (ITEWC) at the Indian National Centre for Ocean Information Sciences (INCOIS) in Hyderabad. In 2014, NIOT reported that system data availability had been 98.83%, with a Mean Time Between Failure (MTBF) of 1.62 years, noting that the majority of these failures were due to external impacts, including weather and human interference with the surface buoys, resulting in damage to surface communication and data systems.

The challenge

Offshore renewable energy projects need data throughout their lifespans to support proper design, installation, operation, and maintenance*.  This includes bathymetry and geotechnical data, but also metocean data, such as current, wave and sea height characteristics.

Water current profiles, for example, are needed to help locate turbine foundations, cables and cable landfalls. During the life of a project, operators need to understand what’s happening in the water column and at the seabed, to prevent downtime, ensure safe and efficient operations and understand fatigue life.

As wind farms start to be built in deeper waters, ocean data becomes even more critical, as conditions become more complex and especially where floating platforms will be deployed. Water current, height and direction are all critical, for planning and operations.

Traditionally, much of this data is gathered using seabed sensors, such as acoustic Doppler current profilers (ADCPs) and pressure sensors, and conventional crewed vessels. However, when accurate spatial and temporal data is required, this isn’t always efficient. The required frequency of site visits to gain sufficient data increase risk and cost, especially when sites are further from shore. Because of this, there is growing demand for remote, lower cost and emissions survey and data harvesting solutions that help reduce downtime and improve yield.

For Arctia, it is the perfect partner for towed hydrographic survey equipment such as magnetometers and sidescan sonars used as part of their survey services. With depth ratings of up to 1000 metres and able to operate in temperatures as low as -5 degrees Celsius, it’s ideal for the Baltic Sea and offers the opportunity to upgrade to other versions for depths up to 4,000 metres should Arctia and their customers operate at greater depths in future.

If you have a similar challenge in your subsea navigation and tracking operations, contact us to see how we can help.

At a glance

• All-in-one wireless solution for detecting tsunamis; no fixed sea-to-shore infrastructure required
• Detects height variation on the water surface as small as 1 mm; a change of 3 cm launches a tsunami event (tsunami alert)
• Generates Deep-ocean Assessment and Reporting of Tsunamis (DART®) warnings which can be received onshore within seconds of a confirmed tsunami event
• Low cost of ownership; COTS technology with long service intervals
• IALA compliant buoy for increased safety of the system to guarantee availability
• Remote monitoring and control for ease of operation
• Intuitive shore control interface using MSM Ocean’s NETCOM-TS software

Why choose Sonardyne & MSM?

Easy ownership

Our warning system is commercial-off-the-shelf, can be acquired easily, delivered in short timescales and commissioned without any significant national investment in, or construction of, sea-to-shore infrastructure.

It’s integrated

Competing warning systems are often made up of individual sensors, battery packs and modem with vulnerable connectors and cables. Together with MSM Ocean, we provide a one-stop shop solution that’s rugged and robust.

It’s proven

The system’s built using proven, high security wireless seabed to shore monitoring and communications technology, with proven performance in detecting tsunamis.

Innovation at work

We’ve engineered BlueComm 200 to push the boundaries of your underwater communication. Using advanced LED technology and sensitive photomultiplier tubes, you’ll achieve communication ranges up to 150 m. Its design houses the emitter separately from the receiver, ensuring optimal performance and reliability.

Fast and flexible – key features to power your mission

• Lightning-fast data transfer: 2.5 to 10 Mbps at ranges up to 150 m
• Optimal performance: Perfect for moderate to low turbidity dark water (>200 m depth or at night)
• Flexible deployment: Connect with your AUV, ROV, USV or surface dunker system
• Deep-rated capability: Ready for operations up to 4,000 m
• Speed of light technology: Experience unprecedented data transmission rates

Perfect for your platform

Perfect for your:

• Autonomous Underwater Vehicles
• Extra-large uncrewed underwater vehicles (XLUUV)
• Uncrewed Surface Vehicles
• Remotely Operated Vehicles
• Tracking and communications systems

Choose your perfect match:

BlueComm 200

When you need maximum range and performance in dark water conditions, our visible light system delivers up to 150 m range – ideal for video transfer and direct vehicle control. You’ll transfer data up to 10,000 times faster than acoustic systems, although ambient light may affect operating range.

BlueComm 200 UV

Working with lights on? Our UV variant maintains reliable communication even with artificial lighting present. Operating at ranges up to 75 metres, it’s your go-to solution for ROV and AUV applications requiring illumination, such as video recording missions.

Both systems offer incredible energy efficiency – transfer more than nine gigabytes of data using just one Lithium D cell battery.