5A5 A
 If operating within Ocean Area A1, and outside of NAVTEX coverage, a GMDSS-equipped vessel must carry:
A. Equipment capable of reception of Maritime Safety Information by the Inmarsat enhanced group call system, or HF SITOR (NBDP).
B. A GPS receiver.
C. Equipment capable of maintaining a continuous DSC watch on 2187.5 kHz.
D. An Inmarsat-B terminal.
