<s>
An	O
electronic	B-Application
navigational	I-Application
chart	I-Application
(	O
ENC	O
)	O
is	O
an	O
official	O
database	O
created	O
by	O
a	O
national	O
hydrographic	O
office	O
for	O
use	O
with	O
an	O
Electronic	O
Chart	O
Display	O
and	O
Information	O
System	O
(	O
ECDIS	O
)	O
.	O
</s>
<s>
Inland	B-Application
Electronic	I-Application
Chart	I-Application
Display	I-Application
and	I-Application
Information	I-Application
System	I-Application
are	O
similar	O
systems	O
used	O
for	O
navigation	O
of	O
inland	O
water	O
.	O
</s>
<s>
ENCs	O
are	O
available	O
for	O
wholesale	O
distribution	O
to	O
chart	O
agents	O
and	O
resellers	O
from	O
Regional	O
Electronic	B-Application
Navigational	I-Application
Chart	I-Application
Centres	O
(	O
RENCs	O
)	O
.	O
</s>
<s>
IHO	O
Publication	O
S-63	B-Application
developed	O
by	O
the	O
IHO	O
Data	O
Protection	O
Scheme	O
Working	O
Group	O
is	O
used	O
to	O
encrypt	O
and	O
digitally	O
sign	O
ENC	O
data	O
.	O
</s>
<s>
An	O
Electronic	O
Chart	O
Display	O
and	O
Information	O
System	O
(	O
ECDIS	O
)	O
is	O
a	O
geographic	B-Application
information	I-Application
system	I-Application
used	O
for	O
nautical	O
navigation	O
that	O
complies	O
with	O
International	O
Maritime	O
Organization	O
(	O
IMO	O
)	O
regulations	O
as	O
an	O
alternative	O
to	O
paper	O
nautical	B-Application
charts	I-Application
.	O
</s>
<s>
An	O
ECDIS	O
system	O
displays	O
the	O
information	O
from	O
Electronic	B-Application
Navigational	I-Application
Charts	I-Application
(	O
ENC	O
)	O
and	O
integrates	O
position	O
information	O
from	O
position	O
,	O
heading	O
and	O
speed	O
through	O
water	O
reference	O
systems	O
and	O
optionally	O
other	O
navigational	O
sensors	O
.	O
</s>
<s>
Other	O
sensors	O
which	O
could	O
interface	O
with	O
an	O
ECDIS	O
are	O
radar	B-Application
,	O
Navtex	O
,	O
Automatic	O
Identification	O
Systems	O
(	O
AIS	O
)	O
,	O
and	O
depth	O
sounders	O
.	O
</s>
<s>
ECDIS	O
(	O
as	O
defined	O
by	O
IHO	O
Publications	O
S-57	O
and	O
S-52	O
)	O
is	O
an	O
approved	O
marine	O
navigational	B-Application
chart	I-Application
and	O
information	O
system	O
,	O
which	O
is	O
accepted	O
as	O
complying	O
with	O
the	O
conventional	O
paper	O
charts	O
required	O
by	O
Regulation	O
V/19	O
of	O
the	O
1974	O
IMO	O
SOLAS	O
Convention	O
.	O
</s>
