Saildrone

Persistence is the whole pitch here, and the numbers back it: 65,000 cumulative days at sea is the kind of figure that separates an operational fleet from a prototype program. We'd reach for Saildrone when a mission profile runs weeks or months, the water is contested or remote, and sending a crewed hull is either too expensive or too risky. The platform split matters more than the marketing copy suggests. Spectre Silent Endurance and Spectre Stealth are the defense-tier hulls — one for quiet ASW with towed arrays and variable-depth sonar, one winged-less for faster low-observable runs with concealed payloads for customer-furnished effectors. If your requirement is surface ISR plus bathymetry, Surveyor is the workhorse. Voyager fits mid-size multi-mission work like counter-narcotics and coastal mapping — that's the hull behind the $81M Navy cocaine seizure. Explorer is the affordable persistent option for metocean data. When to pick it: you have a defense or government mandate, a multi-month sensing requirement, and a procurement process that can handle a managed-service contract. The Mission Portal and API mean your analysts consume data rather than maintain boats. When to pass: short tactical windows measured in hours, shallow or ice-heavy water where USV stability gets dicey, and any budget that needs a published price tag before a purchase order. There's no free tier and no self-serve signup. Closest alternatives are crewed patrol assets (higher cost, higher risk, but flexible) and smaller USV vendors (cheaper, shorter endurance, thinner defense integration). We'd treat Saildrone as the endurance-and-integration play, not the cheap option.