What is a Fleet Management System for Vessels?

What "fleet management system" means for a vessel operator

A fleet management system (FMS) for vessels pulls together data that used to live in separate logbooks and separate people's heads — where each vessel is, how fast it is going, how much fuel it is burning and what its engines are doing — into a single live view. For an owner or operator running more than a handful of vessels, that consolidation is the whole point: instead of calling each captain or waiting for an end-of-voyage report, the office sees the fleet as it actually behaves, close to real time.

The problems it solves

Three problems come up again and again for Indonesian fleet operators: not knowing where a vessel is right now, not knowing how much fuel it actually burned versus what was logged by hand, and finding out about a mechanical or bunkering issue days after it started instead of while there is still time to act. A fleet management system addresses all three by pulling sensor data directly from the vessel instead of relying on manual logs written up after the fact.

Position, fuel and engine data in one place

MANTRAZ sends each vessel's position, speed and connection status from the vessel itself every 60 seconds, and keeps 1 to 14 days of track history that can be replayed at up to 16x speed, with each vessel marked Online, Offline, No GPS or No Sensor. Vessels outside cellular range switch to satellite mode, which keeps sending GPS position, engine RPM and auxiliary engine data even without a cellular signal — flowmeter fuel readings resume once the vessel is back in cellular or Starlink range. Alongside position, the dashboard shows RPM, speed and fuel consumption per engine side by side, so the office can see what pushing an engine harder actually costs in fuel.

Measured fuel vs estimated fuel

Not every number in a fleet system is captured the same way, and a system worth trusting should say which is which. On MANTRAZ, main engine fuel is measured directly by flowmeters on the supply and return lines, while auxiliary engine fuel is usually estimated from running hours — reports keep the two apart rather than blending them into one figure. That distinction matters whenever a fuel number is going to support a cost or efficiency decision.

Operating modes, not just a speed number

MANTRAZ lets an operator name RPM bands per engine — idle, maneuver, cruise, full — and classifies every minute the engine runs into one of them. That turns a raw RPM chart into something a fleet manager can coach a crew with: how long an engine spent at full RPM, what share of running time that was, and how many litres each mode burned.

Installation basics

• Sensors on the engine and tanks (flowmeters, RPM pickups, tank level, GPS) go on equipment that is already on board.
• An onboard gateway collects the readings and holds them if the connection drops.
• Starlink, VSAT or cellular near the coast sends the data ashore.
• The team follows the fleet live from the dashboard, with alerts and scheduled reports.

Getting started

If you want to see it working on data like your own fleet's, request a demo and MANTRAZ will walk through the installation plan with you.