The Charterers or their supercargo(es) with Master's prior approval which not to be unreasonably withheld shall have free access to the Whole vessel including bridge, holds and engine room and also to all vessel's tank, including but not limited to bunker, lubricating oil, sludge, ballast and freshwater tanks. Whenever require, the Master shall endeavor to bring the vessel into even trim. If practically possible to ensure correct bunker surroundings. The Charterers and/ or their supercargo(es) and / or surveyors with Master's approval to have free access to the Vessel's deck and engine log books, tank plans, calibration scales and/ or other plans, as requested and are allowed to make copies of the original log books on board or ashore.