7-70I6 D
 What is an advantage of the Iridium system for placing ship-ship calls?
A. Iridium terminals are compatible with the Inmarsat system for maximum flexibility.
B. All ship-ship calls are passed through Iridium ground stations and then forwarded to the other ship.
C. Ships-ship calls are routed through the satellites and passed through ground stations.
D. Iridium satellites can pass the calls directly to the other ship using gateway signaling.
