Loss control tool in locating cargo losses where the "ship to shore" difference is greater than normal. if there is an unaccountable gain in bunker tanks or bunker volumes that cannot be reconciled, a bunker survey can help identify the causes. Ullaging vessels before and after receiving bunker, ullaging bunker barge before and after discharging to vessels. If the vessel alongside, reading of flow meter before and after and sampling of FO/GAS OIL for analysis, is performed.