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Spreadsheet, in-house tool or dedicated ship maintenance software? An honest comparison for fleets of 2 to 30 vessels, with costs, risks and a decision method.

What classification societies require from a PMS, how approval works, and what to look for in planned maintenance system software.

The advertised price of a CMMS says little about its real cost. Licences, rollout, time spent and above all avoided costs: the calculation method over three years.

A dashboard that triggers no decision is worthless. This guide details 15 maritime maintenance KPIs across four families — reliability, execution, cost and compliance — each with its formula, unit, frequency, a realistic target range, the decision it triggers and the calculation trap to avoid.

A line-by-line technical OPEX structure, three budgeting methods, how to cost a planned maintenance system, contingency provisions, monthly tracking on committed/actual/budget, and the argument that lets you defend every line in front of finance. Includes a fully worked illustrative example.

Spreadsheets still run maintenance on thousands of ships, and for good reason: free, familiar, flexible. But past the third vessel, diverging versions, lost history, missed certificate dates and unreliable stock cost far more than software. Breaking points, comparison table, cost calculation and a clean migration path.