Frequently asked questions...

Weather-window analysis estimates when, and for how long, metocean conditions will allow a marine operation to proceed. It turns wind and wave data plus your operating limits into the probability of completing a campaign on schedule.

Aventis runs a Monte Carlo simulation of your campaign against many historical and forecast weather sequences, applying DNVGL-ST-N001 alpha factors so the windows reflect forecast uncertainty. The result is a probabilistic view of operable durations and downtime.

P50 is a central estimate, met or beaten half the time. P90 is a conservative estimate, met or beaten 90% of the time. Planning to P90 builds weather contingency into the schedule and budget.

By tracking every period the simulation spends on standby across the work breakdown structure, Aventis quantifies expected waiting-on-weather time, which can be translated into standby and vessel cost.

Yes. Aventis applies operability and forecast-rating alpha factors in line with DNVGL-ST-N001, scoped per activity, so limiting criteria account for forecast uncertainty over the planning horizon.

Aventis uses metocean time series, significant wave height, wind speed, current speeds, anything you can think of, from client-provided datasets or sourced hindcasts. If you don't have data, go to odsl.co/metmap for a free wind and wave hindcast.

Interconnectors and Offshore wind installation but can be used for any and marine construction and heavy-lift, any campaign where weather windows drive cost and programme risk.

Access to the dashboard is Free. There are two ways to simulate. You can run your own simulations with an Aventis Pro subscription for £695+VAT per month, or one of our installation modelling specialists can run the simulations for you (contact us for details).

Aventis has been deployed on +50GW of offshore renewable projects. Including projects from National Grid, SSE, Iberdrola, Inch Cape OWF, Orsted, Blue Gem and Xlinks