100A B
 Which of the following conditions would be a symptom of malfunction in a 2182 kHz radiotelephone system which must be reported to an onboard or at-sea maintainer under GMDSS?
a) Much higher noise level observed during daytime operation.
b) No indication of power output when speaking into the microphone.
c) When testing a radiotelephone alarm on 2182 kHz into an artificial antenna, the Distress frequency watch receiver becomes unmuted, an improper testing procedure.
d) Failure to contact a shore station 600 nautical miles distant during daytime operation.
