4C Offshore Empowering Intelligence

Blue Tern

Heavy Maintenance and Construction

4C Offshore | Blue Tern
Heavy lift jack-up vessel Blue Tern was build under a 75/25 joint venture company formed by Keppel FELS and the Seafox Group. The vessel can carry up to twelve 3.6 MW turbines, six 6 MW turbines, three jackets or four tripods. The vessel has offices and conference room.

In December 2018, it was announced that Fred. Olsen Windcarrier had acquired 51% ownership of Seafox 5. Keppel Offshore and Marine Ltd holds the other 49% ownership of the vessel.

The vessel made its debut as part of the Fred. Olsen fleet working alongside Brave Tern on Hohe See OWF installing the turbines.


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General Information
Blue Tern
Other Names
Seafox 5
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Vessel Category
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Vessel Classification

Build Information
Construction Country
Year Last Converted

Main Characteristics
Length Overall (LOA)
Minimum Draft
Maximum Draft

Transit Speed
Maximum Speed

Cargo Deck
Free Deck Space
Max. Deck Load

Max Jacking Speed
Num legs
Leg length

Design Criteria
Max Operable Significant Wave Height
Max. Operable Tide Current
Max. Operable Wind Speed

Vessel Identification
Call Sign
IMO Number

Dynamic Positioning (DP) Class
DP Notes

First Crane Capacity
First Crane Radius
First Crane Description
Second Crane Capacity
Second Crane Radius
Second Crane Description
Max. Lifting Capacity

Operator Website
Vessel Spec.