A USV, or unmanned surface vehicle, is a boat or watercraft that operates on the surface of a body of water without a crew on board. These vehicles range from small, surfboard-sized platforms to vessels the size of a commercial boat, and they can be controlled remotely by a human operator or navigate autonomously using onboard software. USVs collect data, perform surveys, and carry out military missions that would otherwise require crewed ships.
How USVs Work
At its core, a USV is a floating platform equipped with sensors, navigation instruments, and a communication system. Some look like traditional motorboats, others resemble sailboats or sleek surfboards. The design depends entirely on what the vehicle needs to do. A USV built for weeks-long ocean monitoring will look nothing like one designed for quick coastal surveys.
Navigation relies on a combination of technologies working together. GPS provides general positioning, while LiDAR (a laser-based system that maps surrounding objects in 3D) helps the vehicle detect obstacles above the waterline. Sonar handles what’s below the surface, with sensing ranges that can reach several kilometers regardless of lighting or water clarity. Many USVs use a technique called simultaneous localization and mapping, where the vehicle continuously builds a map of its surroundings while tracking its own position within that map. An automatic identification system (AIS) lets the USV detect nearby ship traffic, similar to how commercial vessels track each other.
For communication, most USVs transmit data back to operators on a ship or on shore via satellite, often in real time. This means a research team can monitor ocean conditions from thousands of miles away while the vehicle does the fieldwork.
Levels of Autonomy
Not every USV operates the same way. The maritime industry recognizes four broad levels of autonomy, and most USVs operating today fall somewhere in the middle of this spectrum.
- Remote control: A human operator drives the vehicle from a separate location, making all navigation and operational decisions directly.
- Decision support: The vehicle collects real-time data and suggests courses of action to the operator, functioning like a co-pilot. The human still makes the final call.
- Supervised autonomy: The vehicle can take independent action, such as avoiding a collision or adjusting its route, without waiting for human approval. Operators stay informed and can step in when needed.
- Full autonomy: The vehicle operates independently, with human involvement only in exceptional circumstances.
Decision support systems are the most common on the market right now. Fully autonomous vessels are expected to become more widespread as regulations and technology catch up.
Power and Endurance
Most compact USVs run on lithium batteries, which work well for short missions but limit how far the vehicle can travel. A typical battery-powered USV might cover around 8 kilometers before needing a recharge. That’s fine for a quick harbor survey but not enough for multi-day ocean monitoring.
To extend range, some USVs use hydrogen fuel cells, either alone or paired with lithium batteries. In one experimental setup, swapping a lithium battery for a hydrogen fuel cell of similar size and weight pushed cruising range from 8 km to 38 km, with more stable power output. Hybrid systems combining fuel cells and batteries have demonstrated over 12 hours of continuous operation in calm waters.
Many ocean-going USVs take a different approach entirely, drawing power from renewable sources: solar panels, wind sails, or wave energy converters. These designs sacrifice speed for endurance, allowing missions that last weeks or even months without refueling.
Scientific and Commercial Uses
USVs have become valuable tools for ocean science. They carry sensors that measure water temperature, salinity, dissolved oxygen, currents, wave height, and underwater sound. Above the surface, they record air temperature, wind speed and direction, atmospheric pressure, and humidity. Some carry cameras for video and still imagery, and others collect water samples for lab analysis. All of this data can stream back to researchers via satellite in real time.
NOAA has been testing USVs for hydrographic surveying, specifically to map shallow, murky waters along coastlines where crewed ships can’t safely operate. In one evaluation off the Carolinas, a USV called the C-Worker 5 surveyed alongside the NOAA Ship Nancy Foster, running parallel tracks about three kilometers apart for three to four days at a stretch before being recovered for refueling and data transfer. These vehicles proved useful not just for reaching difficult areas but for improving overall survey efficiency.
Beyond government research, USVs are used in offshore energy (inspecting oil and gas infrastructure), aquaculture monitoring, port security, and environmental compliance. The global USV market was valued at roughly $1.23 billion in 2025 and is projected to reach $1.36 billion in 2026, growing at about 10.7% per year.
Military Applications
Naval forces use USVs primarily for missions that are dangerous or tedious for crewed vessels. Mine countermeasures are a major application. The U.S. Navy’s Littoral Combat Ship program uses USVs equipped with minehunting sonar to detect, classify, and identify mines on the ocean floor and in the water column. A separate configuration pairs a USV with a magnetic sweep cable and towed acoustic generator to trigger and neutralize influence mines, which are designed to detonate when they sense a ship’s magnetic or acoustic signature.
Beyond mine clearance, military USVs perform intelligence, surveillance, and reconnaissance missions. They can patrol contested waters, monitor harbor approaches, or relay sensor data back to a command center, all without putting sailors at risk. Their relatively small size and low profile make them harder to detect than crewed patrol boats.
How USVs Differ From Other Unmanned Vehicles
USVs occupy a specific niche in the family of unmanned maritime systems. Autonomous underwater vehicles (AUVs) operate beneath the surface and are used for deep-sea mapping and subsea inspections. Remotely operated vehicles (ROVs) also work underwater but stay tethered to a ship by a cable, giving operators direct control and a live video feed. USVs stay on the surface, which gives them a key advantage: continuous access to GPS signals and satellite communication, plus the ability to collect both atmospheric and oceanographic data simultaneously.
In practice, these systems often work together. A USV might serve as a surface relay station for an AUV operating below, or tow sonar equipment that would normally require a much larger crewed vessel. That flexibility is a big part of why USV adoption is accelerating across both military and civilian sectors.