5.5.1 The automatic speed signal required for
a category A monitoring system should be obtained from the ship's
speed indicating devicefootnoteby means
of a repeater signal. The speed information used may be either speed
over the ground or speed through the water, depending upon the speed
measuring equipment installed on board.
5.5.2 In oil tankers fitted with a category B
monitoring system, the ship's speed may be inserted manually into
the computing unit. Such data should be obtained from the speed log
or from an equivalent source.