The Schiehallion, Loyal and Foinaven fields are located approximately 150km west of the Shetland Islands in quadrant 204 of the UKCS. The water depth is 400m - 500m. Schiehallion, Loyal and Foinaven, together with the Clair field, are situated in the area generally termed the West of Shetland.

The Schiehallion FPSO exploits the Schiehallion and Loyal fields, and the Petrojarl Foinaven FPSO exploits the Foinaven field. Each of the FPSO’s exports oil by means of shuttle tankers.