5
3.
MAINTENANCE
Compass
Bowl
The
compass
bowl
should
be
regularly
inspected
to
ensure
that
there
are
no
leaks
or
bubbles.
In
addition,
the
upper
and
lower
glass
should
be
maintained
in
a
clean
condition,
and
the
compass
gimballing
checked.
A
few
times
per
year,
and
more
regularly
on
vessels
with
high
vibration
levels
or
following
heavy
weather,
an
operational
test
should
be
carried
out
on
the
magnetic
compass
to
ensure
that
no
friction
has
developed
on
the
pivot
and
jewel.
This
operational
test
should
be
carried
out
as
follows:
‐
Whilst
the
vessel
is
alongside,
bring
a
magnetic
object
towards
the
compass
so
that
the
heading
is
deviated
by
2
degrees.
Hold
the
deviated
compass
card
in
this
position
for
10
seconds,
and
then
release
by
removing
the
magnetic
object.
When
the
compass
card
settles
it
should
be
within
15
seconds
of
arc
of
the
original
heading.
If
the
compass
card
does
not
return
within
this
limit
then
there
is
a
high
level
of
friction
between
the
pivot
and
jewel.
The
compass
should
be
overhauled
by
a
competent
authority.
Binnacle
The
C20
Binnacle
has
one
of
the
simplest
periscope
arrangements,
utilising
only
one
lens
and
mirror.
The
lens
is
easily
removed
for
cleaning
at
periodic
intervals
from
the
foreward
side
of
the
binnacle.
The
only
area
where
maintenance
may
be
required
is
with
the
binnacle
lighting.
There
are
two
LED
lamps
within
the
binnacle,
and
an
additional
spare,
all
accessible
by
removing
the
binnacle.
