013C D
 Which is true concerning a required watch on VHF Ch-16.
a) It is compulsory at all times while at sea until further notice, unless the vessel is in a VTS system.
b) When a vessel is in an A1 sea area and subject to the Bridge-to-Bridge act and in a VTS system, a watch is not required on Ch-16 provided the vessel monitors both Ch-13 and VTS channel.
c) It is always compulsory in sea areas A2, A3 and A4.
d) All of the above
