<s>
Maritime	B-General_Concept
identification	I-General_Concept
digits	I-General_Concept
are	O
used	O
by	O
radio	O
communication	O
facilities	O
to	O
identify	O
their	O
home	O
country	O
or	O
base	O
area	O
in	O
Digital	O
Selective	O
Calling	O
(	O
DSC	O
)	O
,	O
Automatic	O
Transmitter	O
Identification	O
System	O
(	O
ATIS	O
)	O
,	O
and	O
Automatic	O
Identification	O
System	O
(	O
AIS	O
)	O
messages	O
as	O
part	O
of	O
their	O
Maritime	O
Mobile	O
Service	O
Identities	O
.	O
</s>
