6A604 C
When may a public coast station authorized to use high frequency narrow-band direct-printing (NB-DP) establish contact with a ship station using telegraphy?
A.Never.  Contact may only be established using NB-DP circuits
B.When the ship is in excess of 300 gross tons
C.When the radio station license reflects authority for this type of operation and harmful interference is avoided
D.When it is known that the vessel does not have a selective ringing or calling device
