More detailed than the pre-transactional expertise, expertise in value meets specifications much more accurate. The entire ship is checked in every detail, all equipment is checked and tested. Checks are carried out to control the dry condition of the hull, the absence of osmosis, the state of the line of propulsion, and flow through tests. The ship requires a preparedness to perform these checks must be current on maintenance and navigation of its securities, insured, and have her on board safety equipment. In all cases, the tests are conducted under the responsibility of the owner. These operations may require the removal of certain equipment in order to carry out their audit.