97J6 B
 How can a GMDSS operator determine the best frequency band to choose for a SITOR (NBDP) transmission to a shore station?
A. By consulting propagation tables.
B. Listen to shore station "free signals" and choose the band with the strongest signal.
C. If static interference is present, try lower bands first.
D. During nighttime, choose higher frequencies. Choose lower frequencies in the daytime.
