Electromagnetic Geoservices (EMGS) has been awarded a multi-year contract in south-east Asia worth up to $73.3m from "one of the world's largest national oil companies", it said.

EMGS' 103-metre research vessel Atlantic Guardian (built 2001) will be employed under the contract for up to two years, the shipowner said in a release on Tuesday.

"This letter of award from a repeat customer, together with the on-going proprietary acquisition in south-east Asia, has secured backlog for both of the company's vessels, providing a sound basis for two-vessel operation for the company in 2019," said Bjorn Petter Lindhom, EMGS' chief executive.