001D D
 GMDSS is primarily a system based on?
a) Ship-to-ship Distress communications using MF or HF radiotelephony.
b) VHF digital selective calling from ship to shore.
c) Distress, Urgency and safety communications carried out by the use of narrow-band direct printing telegraphy.
d) The linking of search and rescue authorities ashore with shipping in the immediate vicinity of a ship in Distress or in need of assistance.
