Measured across 3,024 independent surveys in over 100 ports. The industry loses $2.4–8.4 billion a year on quantity alone — and quantity complaints outnumber quality complaints eight to one.
Scope a two-vessel pilot See your fleet's gap analysisDr. Ram Vis — marine chief engineer, metallurgist, the industry's "Bunker Guru" since 1975 — published twenty of the methods used to steal bunker quantity: cappuccino froth that weighs as tonnes, cut-and-rejoined sounding tapes, calibration books with inserted pages, the magic pipe inside the sounding pipe.
The book shows the industry 20 of the 50+ documented methods.
Our surveyors are trained on all of them.
Unwatched deliveries lose 2–5% of fuel supplied (Dr. Vis's published analysis). Under Viswa attendance, measured across 1.84 million tonnes: 0.180%. What survives is engineered to beat a human — too small to dispute one-by-one, or moved to stems nobody attends. That's what the suite is for: memory, not more muscle.
Industry estimate — published by our founder.
Measured — 1.84M MT of surveyed throughput.
Worth $18–49M on our dataset alone. Both numbers are ours — nobody else has either.
Five services, one watch — every stem your fleet lifts, made whole. Not dashboards: finished documents, in the right inbox, on time.
Every shortfall over the claim threshold returns as a drafted Letter of Protest — your numbers, your vessel's name, inside the claim window.
The supplier's actual track record on your desk before the barge sails. Attendance recommended where the history warrants it.
Sulphur, water, density gaps — and the adulteration tells: cutter-stock dilution flagged for GCMS screening across 120+ contaminants.
One page your CFO reads in five minutes: tonnes lost, dollars recovered, worst ports, worst suppliers, coverage status.
Your loss rate against the industry curve — computed from the only dataset that can.
A chapter-book of what your fleet actually received — running tallies per vessel, supplier, barge, and port. The blurred figures are live and waiting behind a per-vessel licence.
| Port | Surveys | Integrity Score | Claim events | Short delivered | Recoverable value |
|---|---|---|---|---|---|
| Singapore ✔ | 498 | B+ | 57 | 331.9 MT | $182,530 |
| Rotterdam ✔ | 140 | C | 36 | 129.5 MT | $71,254 |
| Houston 🔒 | 134 | B | 23 | 96.1 MT | $52,878 |
| Hong Kong 🔒 | 88 | C | 31 | 88.4 MT | $48,610 |
| Antwerp 🔒 | 252 | B+ | 44 | 102.7 MT | $56,478 |
Illustrative extract from the demonstration ledger. ✔ licensed · 🔒 included with a per-vessel licence. Licensing is per vessel (IMO number) — a regional subscription cannot sign a Letter of Protest; only a licensed vessel's can.
Every number is measured, not reported — taken by attending surveyors, hour by hour, sounding by sounding. Roughly nine of ten quantity losses happen physically during the transfer, not on paper. So somebody has to be standing at the manifold who knows all fifty ways — or wearing the device that does.
On bunker barges and vessel decks, from tropical anchorages to winter berths.
Every survey feeds the same ledger, the same ratings, the same benchmarks.
Photographed, GPS-stamped, cryptographically chained. When a claim is disputed, we open the file.
Our wearable survey trial is documented in Dr. Vis's book — every reading verified, even where no surveyor attends. It hears what humans can't.
"Fifty years ago, in Chennai, I had a problem nobody had solved — how much fuel does a ship's tank truly hold? Every tank is a different shape. So I sat down with trigonometry and worked out standardized calculations for tank capacity. Those methods became standard practice."
"Since then I have spent my life measuring what is actually in ships' tanks, and comparing it to what the paperwork says. And I will tell you what fifty years taught me: the steel never lies. The books sometimes do."
"Fuel does not disappear. When your figures fall short, that fuel went somewhere — into froth pumped as tonnes, a cut-and-rejoined sounding tape, a magic pipe inside the sounding pipe. I documented twenty of these methods in my book. There are more than fifty. Our surveyors are trained on all of them."
"We come to the manifold. We measure everything. And we have nothing to sell you but the truth."
The Viswa Group has protected shipowners' fuel since 1974 — testing, surveying, and forensics trusted across the world's fleets. Behind every survey stands a body of expertise no competitor can assemble.
Fuel quality testing, quantity surveys, and adulteration forensics — through every change the industry has seen.
Marine chief engineer, metallurgist, the industry's "Bunker Guru" — who standardized tank-calibration mathematics and published the book on fuel fraud.
Twenty methods published; the rest taught only to Viswa surveyors. Fifty years of casework, in one trained eye at the manifold.
24 fuel parameters, results benchmarked in 24 hours, kits couriered worldwide — one standard, everywhere fuel is lifted.