Detailed monitoring system requirements for oil tankers to which these Guidelines and Specifications apply are differentiated as detailed below:
.1.1 This system should be fitted to oil tankers of 4,000 dwt and above. It should employ a control unit and be fitted with a starting interlock and an overboard discharge control.
.2.1 This system should be fitted to oil tankers of less than 4,000 dwt but more than 150 gross tons. It should employ a computing unit. No starting interlock is required and the overboard discharge arrangement may be activated manually.