NOAA’s New Ocean Drone Can Replace A Lost Weather Buoy

NOAA announced a new uncrewed surface vehicle for its research fleet, and the pitch is simple. It’s solar-powered, self-propelled, small enough to trailer behind a truck, and built to loiter at sea for months.

Engineers at NOAA’s Pacific Marine Environmental Laboratory in Seattle think it can do almost everything a weather buoy does, plus a lot more. It’s called the SeaTrac, and it’s built by a small company in Marblehead, Massachusetts.

What The SeaTrac Actually Is

The SeaTrac is the commercial name for the SP-48, a bright yellow ocean drone that runs on solar panels and an electric motor. It measures 15.7 feet long and 4.6 feet wide, with an empty weight of 606 pounds and a payload capacity of 154 pounds.

Top speed is 5 knots, or about 5.8 mph. That’s slow by powerboat standards, but speed isn’t the point. The vessel carries a 6.75 kWh battery and can deliver up to 500 watts of continuous power to whatever instruments it’s carrying.

The draft is only 1.4 feet, which matters for coastal work and shallow bays. And because it’s small enough to fit on a standard trailer with a 2-inch ball hitch, NOAA can deploy it from a boat ramp without needing a ship.

Why PMEL Picked It

NOAA’s Pacific Marine Environmental Lab has a track record of taking commercial platforms and modifying them for harder ocean science. PMEL engineers played a major role in advancing Saildrone technology, now used in hurricane missions. They also invented the DART tsunami buoys that anchor the global tsunami warning system.

The SeaTrac fits that same pattern. PMEL bolted on a rear mast for atmospheric sensors, added a profiling winch on the stern for water-column measurements down to 820 feet, and configured it to carry NOAA-designed instruments alongside off-the-shelf gear.

Scott Stalin, acting director of PMEL’s Engineering Development Division, said the platform “checks almost every box.” The appeal is flexibility plus ownership. NOAA buys the vehicle, owns the data, and pays nothing per mission beyond operating costs.

That last point matters. Saildrone operates on a data-as-a-service model, which means NOAA rents the observations. Owning a SeaTrac outright flips the math on long-term research programs.

The Weather Buoy Replacement Mission

The most practical use case PMEL is testing right now is buoy replacement. Weather buoys get lost, damaged, or knocked offline by storms. Replacing them requires a ship, a crew, and a window of decent weather. That can take weeks.

A SeaTrac can be trailered to a coast, dropped in the water, and programmed to autonomously hold station next to a functioning buoy for side-by-side sensor comparison. Andy Chiodi, a PMEL research scientist, said the validation phase will compare readings from the SeaTrac against an operational Pacific buoy to confirm accuracy.

If the data matches, NOAA gets a rapid-deploy backup that can keep a critical observation point alive while a permanent fix is arranged. PMEL engineers tested the system near Puget Sound on March 12, 2026, programming a modified SeaTrac to navigate from shore out to a tsunami buoy in Shilshole Bay.

Other Planned Missions

The buoy-replacement role is just the opening act. PMEL has a SeaTrac slated to support a 2027 Integrated Ecosystem Research Program mission in the northern Bering Sea, where it will capture vertical profiles of current, salinity, and temperature near the retreating sea ice edge.

NOAA’s Great Lakes Environmental Research Laboratory plans to deploy a SeaTrac in Lake Huron’s Saginaw Bay this summer to track harmful algal blooms in real time. Additional Bering Sea missions in 2027 and 2028 will carry an onboard sample processor to detect the marine algae responsible for Paralytic Shellfish Poisoning.

Zachary Gold, who leads PMEL’s Ocean Molecular Ecology program, pictures a future fleet patrolling coastal waters from Alaska to Florida to deliver early warnings to drinking water utilities, fisheries, and aquaculture operations.

DroneXL’s Take

Here’s what I find genuinely significant about this one. The story isn’t the SeaTrac itself. Plenty of companies make mid-size ocean USVs. The story is that NOAA quietly built an in-house engineering culture at PMEL that can take a $300 million-dollar-worth-of-research mission and hand it to a 15-foot boat that fits on a trailer.

The comparison to Saildrone is the part worth watching. Saildrone gets the headlines because their vehicles chase hurricanes and set wind-speed records. That work is real. But Saildrone sells data, not vehicles, and that model only scales so far when a federal lab wants to run hundreds of concurrent missions.

Owning the platform changes the cost curve. A $250,000 asset that NOAA can modify, redeploy, and iterate on beats a rented data feed when the research question is specific and the budget is federal.

The caveat is honest. A 5-knot top speed and a 1.4-foot draft mean the SeaTrac isn’t sailing into a Category 4. It’s a station-keeper and a shallow-water workhorse, not a storm chaser. PMEL knows that.

The point is the fleet, not any one vehicle. Saildrones for the hurricanes, SeaTracs for the buoy gaps and the algal blooms, and whatever comes next for the missions we haven’t thought of yet.

When a federal science agency builds its own modular toolkit instead of renting everything, that’s infrastructure. And infrastructure is how you actually observe a changing ocean.

Photo credit: NOAA