GMDSS Maintainer: Element 9

1. A In ARQ, each character is transmitted twice, about 250 milliseconds apart.
2. B In ARQ, the "information sending station" will transmit a block of three characters that the receiving station will subsequently acknowledge or request it to be retransmitted.
3. C In ARQ, the "information sending station" transmits a block of three characters twice, about 250 milliseconds apart.
4. D SITOR communications can be used to contact a NAVTEX transmitting station when requesting a repeat transmission of a missed NAVTEX message.

Tip: press A-D to answer