048C D
 Which of the following frequencies have been designated for "On-scene" communications in the Global Maritime Distress and Safety System?
a) VHF Ch-22
b) HF radiotelephone on 21.820 MHz.
c) NBDP on 2177.0 kHz and VHF Ch-16.
d) VHF Ch-16 and NBDP on 2174.5 kHz.
