Sub-contracted through NetSurvey to provide Sonsub Survey with specialist data processing personnel onboard the MV Grampian Surveyor for the Medgaz project. As-laid surveys of the pipeline were conducted using ROV mounted sensors, including the use of the Kongsberg HAIN (Hydro-acoustic Aided Inertial Navigation) system for improved positioning accuracy. The NavLab and EIVA software packages were used for data acquisition and processing.