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A tugboat planned maintenance system (PMS) is a digital tool for scheduling, recording and documenting all preventive and corrective maintenance on a tug vessel — covering main engines, Z-drives and azimuth thrusters, auxiliary systems, deck equipment and safety gear. It replaces paper-based maintenance logs with a structured, searchable digital record that is accessible to both the crew on board and the technical manager ashore.
The primary difference between a tugboat PMS and a generic maintenance system is how intervals are measured. Harbour tugs accumulate engine running hours rapidly — a busy harbour tug may run its main engines for 8, 10 or 12 hours in a single day, across multiple short jobs. A PMS that schedules maintenance on calendar intervals alone will either produce over-maintenance on quiet vessels or dangerous under-maintenance on intensively used ones. Running hours-based scheduling, calibrated to actual engine use, is fundamental to a tugboat maintenance system.
Z-drive units, Voith-Schneider propellers and azimuth thrusters are the defining propulsion systems of modern harbour tugs — and the systems most exposed to wear from the high-cycle, high-torque demands of ship berthing and unberthing. These systems require maintenance at intervals specified by the manufacturer in operating hours, with additional inspections triggered by abnormal load events or damage reports. A tugboat PMS that tracks propulsion system running hours separately from main engine hours, and flags service intervals against actual accumulation, prevents the premature failures that cause costly unplanned downtime.
Tow wire and mooring line inspection is a further PMS requirement specific to tug operations. Classification societies and port authorities require periodic inspection and load testing of towing equipment, with records maintained as part of the vessel’s class documentation. A PMS that includes this equipment in the maintenance schedule with the correct class-specified intervals ensures these inspections are not overlooked under operational pressure.
The ISM Code requires systematic maintenance planning and documented completion records for all vessels in scope. For tug operators, the practical challenge is maintaining these records across a fleet of high-cycle vessels where maintenance happens in brief windows between jobs rather than during long sea passages. A tugboat PMS that makes job completion recording fast and simple — accessible on a mobile device at the end of a shift — achieves better completion rates and more reliable documentation than a system that requires navigating a desktop application to close a job.
Classification society surveys impose calendar-based maintenance and inspection deadlines on specific equipment regardless of running hours. Annual surveys, intermediate surveys and the special survey cycle must be planned and documented to class standards. A tugboat PMS that tracks class-due dates alongside running hours intervals — and alerts the fleet manager when survey windows are approaching — converts class survey management from a reactive task into a planned process, with time to complete outstanding items and book the attending surveyor without disrupting port operations.
STAR Suite™ supports running hours-based maintenance scheduling alongside calendar intervals, giving tug operators the dual-trigger maintenance management that high-cycle vessel operations require. The platform works fully offline on board, so maintenance can be recorded during shifts regardless of port connectivity, with automatic synchronisation to the shore-side system when the vessel connects.
Tug fleet management software — fleet-level oversight of maintenance, compliance and operations across a harbour or offshore tug fleet.
Tug running hours maintenance tracking — how running hours-based intervals work in practice for high-cycle tug engine maintenance.
Harbour tug planned maintenance — the specific maintenance patterns and operational constraints of harbour tug operations.