4.1 The EGC equipment should normally be powered
from the ship's main source of electrical energy. In addition, it
should be possible to operate the EGC equipment, and all other equipment
necessary for its normal functioning, from an alternative source of
energy.
4.2 Changing from one source of supply to another,
or any interruption of up to 60 seconds' duration of the supply of
electrical energy, should not require the equipment to be manually
re-initialized and should not result in loss of received messages
stored in the memory.