Fred. Olsen Cruise Lines has completed a retrofit of the propulsion control system aboard its flagship vessel Bolette, replacing the ship’s DEGO III engine governor with Qtagg’s latest DEGO IV platform to include digital control, real-time operating data and more detailed performance logging.
The move aims to provide engineers with greater visibility of propulsion system behaviour and additional tools for diagnostics and remote support.
DEGO IV adjusts control in response to changes in engine speed and load, helping maintain the required operating speed within safe limits. Combined with an upgraded actuator system, it also provides more precise control of the fuel rack as propulsion demands change.
High-frequency data logging allows engineers to examine system responses in greater detail, supporting tuning and troubleshooting. Qtagg’s DegoAid engineering tool brings configuration, monitoring, tuning and diagnostics together, while allowing configuration data to be stored and reused for commissioning and future service work.
“We continuously review opportunities to improve our onboard systems where they support reliability, safety and the guest experience,” said Håvard Næss, Senior Superintendent at Fred. Olsen Cruise Lines.
“The DEGO IV upgrade gives Bolette a modern platform that supports the high standards we expect from our vessels.”



