A demurrage claim arrives.
OAS Demurrage Management System captures every vessel event as it occurs. By the time the claim arrives, your position is already built, time-stamped, and ready to validate.
Our customers save $1M+ annually by capturing every timesheet and delay.

The world's leading operators and terminals trust Maron.
Demurrage Visibility, From First Event to Final Invoice
Our Product
Every event. Logged. Nothing missed
NOR tender, berthing, hose connections, pumping, delays, departure — each logged in OAS with required fields and cause codes as they occur. Real-time capture
Their statement vs yours. Line by line.
When a counterparty statement arrives, compare it against your OAS record line by line. Every difference is backed by documented evidence so you always know exactly where you stand. Dispute defence
Your demurrage exposure. Always in sight.
See past, current, and projected demurrage costs in OAS by vessel, berth, or time period so decisions are based on data, not estimates. Live visibility
Reduce the waiting time that generates demurrage.
OAS drag-and-drop scheduling with constraint checks optimises berth and jetty utilisation, reducing the waiting time that leads to demurrage.Berth scheduling
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Documented. Validated. Done.
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Key Features | Everything your team needs to log it, track it, and validate every invoice.
Smarter planning starts here
Capture it once. Get it right.
Every vessel event logged at the jetty with required fields. Built as it happens, not pieced together later.
Know where every dollar is coming from.
Demurrage performance by vessel, berth, and period. See the patterns before they become a cost.
One record. Every team.
Operations, planning, and accounting on the same data. No conflicts when reconciliation starts.
Catch the conflict before it generates demurrage
Drag-and-drop scheduling flags berth overlaps ahead of vessel arrivals. Act early enough to have the berth ready when the vessel arrives.
Rethink demurrage in 20 minutes
Download our diagnostic, step-by-step guide to uncover where demurrage recovery is most within reach. Walk away with:
- Clarity on what’s driving your costs
- Operational habits and disciplines that put demurrage under control
- Confidence that your efforts are going to the right place
Free Guide
Take Me to the Guide
