<s>
A	O
ramark	B-Algorithm
,	O
acronym	O
for	O
radar	B-Application
marker	O
,	O
was	O
a	O
type	O
of	O
radar	B-Application
beacon	O
used	O
to	O
mark	O
maritime	O
navigational	O
hazards	O
.	O
</s>
<s>
Ramarks	B-Algorithm
are	O
no	O
longer	O
in	O
use	O
.	O
</s>
<s>
They	O
were	O
wide-band	O
beacons	O
which	O
transmitted	O
either	O
continuously	O
or	O
periodically	O
on	O
the	O
radar	B-Application
bands	O
.	O
</s>
<s>
The	O
transmission	O
formed	O
a	O
line	O
of	O
Morse	O
characters	O
on	O
a	O
plan	B-Algorithm
position	I-Algorithm
indicator	I-Algorithm
(	O
PPI	O
)	O
radar	B-Application
display	O
which	O
radiated	O
from	O
the	O
centre	O
of	O
the	O
display	O
to	O
its	O
edge	O
,	O
hence	O
giving	O
only	O
a	O
bearing	O
,	O
as	O
opposed	O
to	O
radar	B-Application
beacon	O
(	O
racons	O
)	O
which	O
gives	O
bearing	O
and	O
position	O
.	O
</s>
<s>
Periodic	O
transmissions	O
every	O
few	O
seconds	O
are	O
usually	O
used	O
so	O
that	O
important	O
radar	B-Application
targets	O
behind	O
the	O
ramark	B-Algorithm
beacon	O
are	O
not	O
masked	O
by	O
the	O
Morse	O
characters	O
.	O
</s>
<s>
Ramark	B-Algorithm
beacons	O
are	O
less	O
commonly	O
used	O
than	O
racons	O
which	O
give	O
the	O
location	O
as	O
well	O
as	O
the	O
bearing	O
of	O
the	O
hazard	O
and	O
do	O
not	O
clutter	O
the	O
display	O
so	O
much	O
.	O
</s>
