19 Jan Voyage Optimisation in Extreme Weather: The OSTRO I Case Study.
The OSTRO I Case Study
Ascenz Marorka supported OSTRO I (Union Maritime Limited) on a voyage from Lavera to Antwerp during a period of rapidly deteriorating weather conditions. The engagement focused on balancing required speed versus actual speed over ground (SOG), monitoring developing storm systems, assessing wave and wind impact factors, and continuously optimising ETA at each waypoint to ensure a safe and efficient passage.
Operational Focus
- Required speed versus actual SOG
- Developing storm systems
- Wave and wind impact factors
- ETA at each waypoint
Leveraging Wind-Assist Technology (WASP)
OSTRO I’s sails contributed approximately +1.2 knots of positive wind effect, helping offset wave-induced slowdowns of –1 to –1.5 knots. This performance advantage was fully integrated into Ascenz Marorka’s routing recommendations and decision-support process.
Outcome
- The vessel successfully cleared the high-risk zone before wave heights exceeded 6–8 metres
- ETA to Antwerp was maintained despite rapidly worsening conditions
- Crew and vessel safety were protected, avoiding a potential 10-day delay
- High client satisfaction was achieved through transparency, precision, and 24/7 support
Client Feedback (Union Maritime Limited)
“With the approaching weather, and the potential for more than 10 days’ delay if we missed the narrow opportunity to get ahead of it, the support of your platform and Fleet Centre team was appreciated.”
“The forecast quality from Ascenz Marorka enabled this window to be identified early. The enhanced support from the Fleet Centre gave additional assurance to the Master. OSTRO I’s sails helped support her speed and clear the weather, and this benefit was factored into the route recommendations.”
— Jesse Bryce, Manager – Fleet Performance, Union Maritime Limited
What This Case Demonstrates
The OSTRO I voyage demonstrates how modern voyage optimisation combines:
- Accurate early weather intelligence
- Dynamic routing and continuous monitoring
- Real-time decision support by experienced navigators
- Integration of wind-assist performance data
Together, these capabilities enable safer, greener, and more commercially efficient voyages, even in some of the most challenging weather systems.
About GTT
GTT is a technology and engineering group with expertise in the design and development of cryogenic membrane containment systems for use in the transport and storage of liquefied gases. Over the past 60 years, the GTT Group has designed and developed, to the highest standards of excellence, some of the most innovative technologies used in LNG carriers, floating terminals, onshore storage tanks and multi-gas carriers. As part of its commitment to building a sustainable world, GTT develops new solutions designed to support ship-owners and energy providers in their journey towards a decarbonised future. As such, the Group offers systems designed to enable commercial vessels to use LNG as fuel, develops cutting-edge digital solutions to enhance vessels’ economic and environmental performance, and actively pursues innovation in the field of low-carbon solutions.
GTT is listed on Euronext Paris, Compartment A (ISIN FR0011726835 Euronext Paris: GTT) and is notably included in the CAC Next 20, SBF 120, Stoxx Europe 600 and MSCI Small Cap indices.
For more information, visit www.gtt.fr
Media contact: press@gtt.fr / +33 (0)1 30 23 20 43
Investor relations contact: information-financiere@gtt.fr / + 33 (0)1 30 23 20 87
About Ascenz Marorka
Ascenz Marorka, a GTT group company, is a leading provider of digital solutions for Smart Ships in the maritime industry, offering one of the most comprehensive, innovative and reliable digital platforms for ship-owners and charterers around the world.
As part of the GTT Group, Ascenz Marorka operates within GTT’s unified Digital Division alongside Danelec and Vessel Performance Solutions. Together, they serve over 17,000 vessels with the industry’s most comprehensive, agnostic platform for high-frequency data, real-time analytics, and regulatory compliance.
Ascenz Marorka portfolio comprises solutions for LNG Cargo Management, Electronic Fuel Monitoring, Vessel Performance Management, Emissions Monitoring, Operational and Regulatory Reporting, Voyage Optimisation.
