Marine services provider James Fisher Subtech (JF Subtech), part of James Fisher and Sons plc, has signed a charter agreement with Østensjø Rederi AS for the exclusive use of its inspection, repair, and maintenance (IRM) and construction vessel, Edda Savanah.JF Subtech will start using the vessel in April 2023 for work in the North and Irish Seas on IRM projects for JF Subtech’s customers