QUANZHOU RISEN RS-507M Instruction Manual page 21

[DSC].
·The ID code for the Group call must be set in advance.
④ Push [▲] or [▼] to select the desired intership channel, and push [DSC].
·Channel 70 is selected and "READY" appears.
Push [DSC] to transmit the Group call.
⑤
·If Channel 70 is busy, the transceiver stands by until the channel become clear.
⑥ After the Group call has been transmitted, the display changes to the previously
specified channel.
⑦ Push and hold [PTT] to communicate your message to the responding ship.
◆ Receiving a Group call
While monitoring Channel 70 and a Group call is received:
① The emergency alarm or beeps sound depending on the received category.
② "DSC" appears and "RCV GROUP" scrolls at the channel comment indicator.
③ Push any key to stop beep.
④ Push [DSC] to select the channel specified by the calling station for voice
communication; Push any other key to ignore the Group call.