The format is that of ITC Hulls and are for use with the MAR Policy form. An important extension on payment of extra premium is Machinery Damage Extension to include loss or damage to motor, electrical equipment and batteries caused by (a) latent defects in hull or machinery, breakage of shafts or bursting of defective part, broken shaft or burst boiler (b) Negligence of any person, but excluding the cost of making good any defect resulting from either negligence or breach of contract for repair or alteration work carried out and (c) Heavy Weather