Toyota 2003 Prius Owner's Manual page 202

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(f) Emergency broadcast
If an emergency broadcast is received
during reception of other than AM broad-
casting, "ALERT" appears and an emer-
gency broadcast will start.
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(g) Radio text message
If "MSG" appears during FM reception,
touching the "MSG" switch displays the
message display screen which indicates
the text message from the RDS station.
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If a new message is received with the
first text message on the display, "MSG"
appears on the corner of the screen
again. When you touch "LATEST MES-
SAGE", the new message appears.
The RDS audio system can store three
messages consisting of 64 characters. To
store a message in memory, touch the
"STORE" switch until you hear a beep.
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