Seahub Alternative: When PMS Becomes a Bottleneck

A chief engineer files a routine generator service in the planned maintenance system at 09:00. At 10:30 the chief stew updates a Google Drive folder with a new STCW certificate. At 14:00 the captain enters last week's APA in a charter spreadsheet. By the end of the day, the management company's compliance officer uploads a drill record to a separate cloud folder that belongs to ISM rather than to the vessel.

Four updates. Four systems. One vessel.

This pattern is the operational reality on most 30 to 50 metre superyachts running Seahub today, and it is not Seahub's fault. Seahub does what it was built to do — planned maintenance, machinery hours, service intervals, parts history — with engineering discipline. The question for vessel managers and DPAs evaluating a seahub alternative in 2026 is not whether Seahub is a strong PMS. The question is whether a PMS-only system is enough when the operation around it requires expenses, crew compliance, charter accounting, and ISM workflow that the PMS does not touch.

The PMS Scope Question

Seahub presents itself, accurately, as software built by engineers for engineers. The product's core is the maintenance schedule: tasks linked to machinery, hours-based and calendar-based triggers, parts and labour against each service, a defensible history of what was done and when. For a chief engineer working through a yard period, this is the right tool, and the interface rewards a technical user.

What sits outside the system, by design, is everything that is not maintenance. Expenses are not tracked in Seahub. Crew employment, STCW certificates, hours of rest, and onboarding documents are not tracked in Seahub. Charter APA, guest preferences, and trip logs are not tracked in Seahub. ISM workflow — drill schedules, audit findings, non-conformity tracking, the document hierarchy from SMS through risk assessments — is not tracked in Seahub.

A vessel manager running Seahub therefore runs Seahub plus whatever has been assembled to cover the rest: spreadsheets for expenses, a Dropbox folder for crew documents, a charter accounting template inherited from the previous captain, and a cloud file for the ISM manual. Each parallel system is workable in isolation. The cost shows up in the coordination between them.

What Seahub Does Well

A fair evaluation begins with what Seahub gets right. The maintenance scheduling engine is depth-first rather than breadth-first, which suits chief engineers who want the system to follow their reasoning rather than impose its own. The data model respects how engineering departments think about machinery hierarchies, and the reporting supports the audit trail that classification surveyors expect.

The Australian and Pacific superyacht segment has adopted Seahub steadily, particularly on 25 to 45 metre vessels out of the Gold Coast, Auckland, and Fremantle corridors. Seahub's case studies read like technical references rather than marketing collateral — the appropriate register for the audience.

Pricing, by third-party estimate, sits at roughly USD 1,050 to USD 3,000 per vessel per year — a reasonable mid-market position for a focused PMS, particularly for owner-operators and small management companies who need the engineering tool and do not require the wider scope. For those operations, the case for migration is weaker.

Where the Gap Shows Up

The case for migration becomes stronger when the parallel-systems tax becomes visible, and it becomes visible in three moments.

The first is the chief engineer rotation. A new chief engineer inherits Seahub plus three spreadsheets plus a paper file for ISM plus a charter template. Onboarding takes weeks because the systems do not reference each other — a generator service in Seahub does not link to the supplier invoice, which does not link to the related risk assessment in the ISM file. The engineer learns the vessel one system at a time.

The second is the audit. An ISM external audit asks for evidence that the most recent fire pump drill aligns with the fire pump service record. In a unified system, both records sit in the same vessel timeline. In a Seahub-plus-parallel-files operation, the auditor receives one record from the PMS, a separate file from the ISM folder, and an implicit request to trust the two correspond. The finding, when written, is usually against the absence of demonstrable integration rather than against the underlying compliance.

The third is the vessel sale. When the owner instructs the broker, the seller is asked for a complete operational record that exists across four systems. The broker spends six to twelve hours assembling a handover packet that should have existed as a single artefact, and the buyer's surveyor flags any inconsistency as an open question. The price reduction conversation that follows is paid in cash by the seller and in reputation by the broker.

Each moment has a cost. None is catastrophic in isolation. It is the accumulation that makes the parallel-systems posture expensive over the holding period.

The Consolidation Argument

The argument for OwlMar is not that Seahub's PMS is inadequate. It is that the maintenance discipline Seahub provides should live inside the same vessel record as the expenses, crew documentation, charter accounting, and ISM workflow that surround it.

In a consolidated system, the chief engineer files a generator service against the same vessel record that holds the supplier invoice. The chief stew records a new STCW certificate against the same crew profile the management company sees during a flag inspection. The captain logs a charter APA against the same ledger the owner sees during annual review. The DPA tracks an ISM non-conformity against the same operational timeline that records when the corrective action was completed and who signed it off.

The integration removes the version drift that creates handover and audit risk. It also produces a side benefit: Wyse-I, the AI assistant trained on the vessel's actual manuals, oil sample reports, and operational history, can answer questions across maintenance, compliance, and financial records without the operator switching context. A question such as "when was the last fuel polishing service and what did it cost" requires two systems in the current posture and one in the consolidated one.

The broker handover wizard is the cleanest expression of this consolidation. When the vessel transacts, the handover packet is not assembled. It is exported.

The Migration Reality

Migration from Seahub to OwlMar is not a one-click process. Seahub does not publicly document a self-serve bulk export. The practical sequence is the following.

1. Open a support request with Seahub for a structured CSV or Excel export of the vessel's maintenance schedule, machinery hierarchy, parts catalogue, and service history. The export typically arrives within a working week.
2. Submit the export to OwlMar's AI-driven importer, which reads the field structure and proposes a mapping into the unified maintenance schema. Where the importer is uncertain, it flags fields for manual review rather than guessing.
3. Review the mapped record alongside the original so that naming differences — particularly around machinery identifiers and parts SKUs — can be confirmed before the historical data becomes the working record.
4. Layer in the surrounding data that did not live in Seahub: expense history from spreadsheets, crew documents from Dropbox, ISM documentation from the cloud file, and charter records from the captain's template.
5. Run both systems in parallel for one operational cycle — typically a single charter or yard period — so that the chief engineer can verify the consolidated record before Seahub is decommissioned.

The honest framing is that migration takes coordinated effort rather than an afternoon. For operations where the parallel-systems tax is visible, the migration pays back inside the first audit cycle or the first crew rotation.

The Honest Constraint

Some vessels do not need consolidation. If a vessel's operation runs through a single chief engineer who lives in Seahub, if expenses are small and adequately tracked in a spreadsheet, if the crew is owner-managed and documentation requirements are light, and if the vessel is not chartered and not subject to ISM, then Seahub plus a few parallel files is a defensible posture. The migration is a choice rather than an urgency. The case is strongest on chartered superyachts, ISM-compliant vessels, fleets under a management company, or any operation where the vessel will likely sell within the holding period — operations where the parallel-systems tax is paid daily, even when it is paid silently.

Closing

A vessel manager or DPA evaluating a seahub alternative should expect to make the decision once and live with the consequences for several years. The decision is not principally about features. It is about whether the operation has outgrown a PMS-only posture and would benefit from consolidating the surrounding documentation into the same record. Where the answer is yes, the migration is workable, the AI importer reduces the configuration burden, and the parallel-systems tax becomes a one-time conversion cost rather than a recurring drag.

For specific questions about migration scope, the Help Co-Pilot widget on the OwlMar platform answers migration-specific questions without requiring a full account signup.

Related reading: Paper Logbooks to AI: Modernising Superyacht Maintenance Records.