Raymarine Ray215 Owner's Handbook Manual page 43

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7. Press the PTT key to send the Individual Ship's Call. After the digital
"packet" of information is sent, the radio waits for an acknowledgment
from the targeted ship or station.
8. If the target station acknowledges, a tone sounds and "ACK"
illuminates on the LCD. After 2 seconds, the RAY215 switches to the
previously selected working channel.
OR
If the call is not acknowledged, exit the DSC mode by pressing 16/9.
Note: The operation is cancelled if the 16/9 key is pressed or if no keys
are pressed for 60 seconds during any part of this process.
ROTATE
CH
Select letter assigned to desired MMSI
PRESS
DSC
[TX] Flashing
2 seconds after receiving ACK,
switches to selected channel
To store an MMSI number in phonebook:
1. Press and release the DSC/PRI and D/L / I.C. keys simultaneously to
place the unit in DSC mode. "70" appears in the large channel display,
the DSC indicator illuminates, and "in" appears in the small channel
display to designate individual call.
Operation with a Fist Microphone
PRESS & REL
DSC + D/L
Radio enters DSC mode
PRESS & REL
DSC
Returns to last used channel
PRESS
PTT
Standby for ACK from specified ship
PRESS & REL
SCAN
ROTATE
CH
Select working channel
ACK received from specified ship