Integrity. Performance. Delivered.

Fuel doesn't disappear.
It gets taken.
Do you know what's really in your tanks — right now?

Your noon reports say one thing. The steel says another. Viswa ROB Assurance independently verifies every tonne aboard every vessel — every fuel, every tank, before and after every bunkering — with unannounced checks your crews cannot predict.

Book a Fleet ROB Baseline Audit See a Sample Report
The problem nobody talks about

The supplier isn't the only one with hands near your fuel.

33 m³found mid-bunkering

In a recent attended operation, 33 cubic metres of water were discovered inside a receiving tank's sounding pipe — while the sample tested clean. Only independent attendance caught it.

$30,321of "lost" fuel found

A recent ROB verification identified excess fuel aboard — real, burnable tonnes the ship's own books had lost track of. Found fuel is found money.

3ways ROB books lie

Opening figures inflated to hide short deliveries. Opening figures deflated to "find" sellable fuel later. Sludge counted as liquid. All three are detectable — from shore.

How it works

The Bunkering Frame: three walls, no gaps.

Most fuel monitoring watches what ENTERS the ship. We verify the whole frame — because the oldest tricks in the book live in what was already aboard before the hose ever connected.

WALL ONEBEFORE

What was truly in the tanks before bunkering — independently gauged, every tank, every fuel, against the ship's own books. The setup fraud dies here.

WALL TWOENTERED

What actually came aboard — verified against the BDN, with every quantity trick in our fifty years of casework screened for. Shortfalls become claim documents within 72 hours.

WALL THREEAFTER

Before + Entered must equal After. When the closing survey disagrees, we know exactly which window the fuel left through — and it's in writing.

Every fuel, including the new ones

VLSFO, HSFO, distillates — and methanol, ammonia, LNG, biofuel blends. Each has its own physics, its own gauging discipline, and its own new-generation cheat. Excess "boil-off" claims are the new cappuccino — and boil-off is computable.

Surprise checks, truly unpredictable

Risk-weighted random scheduling. Your office knows the plan; the vessel never does. A predictable check is a useless check.

Continuous ROB ledger

Between attendances, every noon report reconciles against the verified baseline. Drift beyond tolerance triggers the next unannounced boarding — automatically prioritized.

Why Viswa

Fifty years of knowing exactly where fuel hides.

Dr. Ram Vis — on why tanks tell the truth when books don't

The scientist who standardized bunker tank calibration mathematics — and literally wrote the book on fuel quantity fraud — explains what fifty years of tank surveys teach you about the difference between a logbook and reality. (video placeholder — to be filmed to the transcript below)

"Zero sounding is not zero volume. The book says empty; the steel says otherwise. We measure the steel."
TRANSCRIPT — DR. RAM VIS

"This is a sounding bob. Brass, so it does not spark. Heavy, so it finds the bottom and tells the truth about what is above it. I have held one for fifty years, on more ships than I can count — and it has never once lied to me. I wish I could say the same for every logbook I have read."

"The supplier's barge is not the only place fuel goes missing. It can go missing from your own tanks, under your own flag, between your own noon reports — an opening figure inflated to hide a short delivery, an opening deflated to find sellable fuel later, sludge counted as liquid."

"Today ships burn methanol, ammonia, LNG — harder to gauge than heavy oil ever was. Their losses hide behind a scientific-sounding word: boil-off. But boil-off obeys physics. We compute the envelope. Losses inside it are weather; losses outside it are questions that deserve answers."

"We come unannounced. We measure everything. We tell only you. And we have nothing to sell you but the truth."

Every finding is reviewed and released by a named Viswa scientist — never by software alone. Every number traces to a hash-sealed survey record you can audit, line by line. And findings about your crews go to you alone — never to third parties, never in writing first. We protect honest crews as fiercely as we protect your fuel: a sealed record means no one can blame your engineer for a barge's froth.

Start with the truth: a Fleet ROB Baseline Audit.

Two vessels, you pick them. We verify every tank against the books and hand you the frame — what's aboard, what's missing, what's found. One quarter. Three numbers. Exit anytime. Found fuel routinely pays for the audit.

Request the Baseline Audit

Preferred by operators of methanol- and ammonia-fueled tonnage: the newer the fuel, the fewer the people who can gauge it — we are those people.