MSS
Is the category for mandatory action signs which provide mandatory notices and instructions.
Close hatches 15 X 15
To signify hatches on a lifeboat, or fully enclosed rescue boat, must be closed
Disconnect mains plug from electrical outlet 15 x 15
To signify that the mains plug must be disconnected from electrical outlet for the purposes of maintenance of electrical equipment, in the case of malfunction or when left unattended
Lower to the water (lifeboat) 15 x 15
To signify the lifeboat is to be lowered or the location of the control to lower lifeboat to the water
Lower to the water (liferaft) 15 x 15
To signify a liferaft must be lowered or the location of the control to lower liferaft to the water