The Oil Discharge Monitoring Equipment (Smart ODME) has been designed to provide means of monitoring, recording and controlling the ballast discharge in accordance with the requirements of MEPC 108(49). Discharge limits are set at 30 litres per nautical mile, and the total discharge is expressed as a proportion of the previous cargo for dirty ballast. The requirements of the MARPOL Convention are that all oil tankers with a gross tonnage of 150 GRT and above must have an oil discharge monitoring and control system installed, incorporating an approved oil content meter, with a starting interlock and an automatic overboard valve control system. The Smart ODME includes all components required to meet MEPC 108(49) and is designed for ease of installation and maintenance. The requirements in IMO Resolution MEPC 108(49) apply to tankers with a date of keel laying or equivalent stage of construction of 1st January 2005 or later.