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Nautical Terms
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Mike
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magnetic
bearing
-
The
bearing
of
an
object
after
magnetic
variation
has
been
considered,
but
without
compensation
for
magnetic
deviation. |
|
magnetic
course
-
The
course
of
a
vessel
after
magnetic
variation
has
been
considered,
but
without
compensation
for
magnetic
deviation. |
|
magnetic
deviation
-
Compass
error.
The
difference
between
the
reading
of
a
compass
and
the
actual
magnetic
course
or
bearing
due
to
errors
in
the
compass
reading.
These
errors
can
be
caused
by
metals,
magnetic
fields
and
electrical
fields
near
the
compass.
Prior
to
using
a
compass,
magnetic
deviation
should
be
recorded
for
many
different
points
on
the
compass
as
the
error
can
be
different
at
different
points.
The
act
of
checking
for
magnetic
deviation
is
called
swinging. |
|
magnetic
north
-
The
direction
to
which
a
compass
points.
Magnetic
north
differs
from
true
north
because
the
magnetic
fields
of
the
planet
are
not
exactly
in
line
with
the
north
and
south
poles.
Observed
differences
between
magnetic
and
true
north
is
known
as
magnetic
variation. |
|
magnetic
variation
-
The
difference
between
magnetic
north
and
true
north,
measured
as
an
angle.
Magnetic
variation
is
different
in
different
locations,
so
the
nearest
compass
rose
to
each
location
on
a
chart
must
be
used. |
|
main
mast
-
The
tallest
or
only
-
mast
on
a
boat. |
|
main
topsail
-
A
topsail
on
the
main
mast. |
|
mainsail
-
The
main
sail
that
is
suspended
from
the
main
mast. |
|
mainsheet
-
The
line
used
to
control
the
mainsail. |
|
make
fast
-
To
attach
a
line
to
something
so
that
it
will
not
move. |
|
make
way
-
Moving
through
the
water. |
|
marina
-
A
place
where
boats
can
find
fuel,
water
and
other
services.
Marinas
also
contain
slipslips
where
boats
can
stay
for
a
period
of
time. |
|
marl
-
To
wrap
a
small
line
around
another. |
|
marline
-
A
small
line
used
for
whipping,
seizing,
and
lashing. |
|
marlinespike
-
A
pointed
tool
used
to
separate
the
strands
of
a
rope
or
wire. |
|
mast
boot
-
A
protective
cover
wrapped
around
the
mast
at
the
deck
on
a
keel
stepped
boat
to
prevent
water
from
entering
the
boat. |
|
mast
step
-
The
place
that
supports
the
bottom
of
the
mast.
The
mast
step
usually
has
a
built
in
pattern
fitting
a
matching
pattern
on
the
bottom
of
the
mast,
enabling
the
mast
to
be
accurately
positioned. |
|
mast
track
-
A
track
or
groove
in
the
back
of
the
mast
to
which
the
sail
is
attached
by
means
of
lugs
or
the
bolt
rope. |
|
masthead
light
-
Also
known
as
a
steaming
light.
The
masthead
light
is
a
white
light
that
is
visible
for
an
arc
extending
across
the
forward
225°
of
the
boat.
When
lit
the
masthead
light
indicates
that
a
vessel
under
power,
including
sailboats
with
engines
running.
Masthead
lights
are
usually
located
halfway
up
the
mast
rather
than
at
the
top. |
|
masthead
-
The
top
of
a
mast.
Wind
direction
indicators
and
radio
antennas
usually
collect
on
the
masthead. |
|
MAYDAY
-
An
internationally
recognized
distress
signal
used
on
a
radio
to
indicate
a
life
threatening
situation.
Mayday
calls
have
priority
over
any
other
radio
transmission
and
should
only
be
used
if
there
is
an
immediate
threat
to
life
or
vessel.
Mayday
comes
from
the
French
M'aidez
which
means
help
me.
For
urgent
situations
that
are
not
immediately
life
threatening
there
is
the
PAN
PAN
identifier.
Less
urgent
messages
such
as
navigational
hazards
should
send
a
SECURITE
message. |
|
mean
low
water
-
A
figure
representing
the
average
low
tide
of
a
region. |
|
measured
mile
-
A
course
marked
by
buoys
or
ranges
measuring
one
nautical
mile.
Measured
miles
are
used
to
calibrate
logs. |
|
Mediterranean
berth
-
A
method
of
docking
with
a
boat's
stern
to
the
dock. |
|
messenger
-
A
small
line
used
to
pull
a
heavier
line
or
cable.
The
messenger
line
is
usually
easier
to
throw,
lead
through
holes
or
otherwise
manipulate
than
the
line
that
it
will
be
used
to
pull. |
|
midchannel
buoy
-
A
red
and
white
vertically
striped
buoy
used
in
the
United
States
to
mark
the
middle
of
a
channel.
Midchannel
buoys
may
be
passed
by
on
either
side.
Also
see
nun
and
can
buoys. |
|
midships
-
A
place
on
a
boat
where
its
beam
is
the
widest. |
|
mil
-
Distance
at
sea
is
measured
in
nautical
miles,
which
are
about
6067.12
feet,
1.15
statute
miles
or
exactly
1852
meters.
Nautical
miles
have
the
unique
property
that
a
minute
of
latitude
is
equal
to
one
nautical
mile
there
is
a
slight
error
because
the
earth
is
not
perfectly
round.
-
Measurement
of
speed
is
done
in
knots
where
one
knot
equals
one
nautical
mile
per
hour. |
|
millibar
-
A
unit
of
pressure
used
to
measure
the
pressure
of
the
atmosphere.
1
millibar
equals
0.03
inches
of
mercury. |
|
mizzen
sail
-
The
sail
on
the
aft
mast
of
a
ketch
or
yawl
rigged
sailboat. |
|
monkey
fist
-
A
large
heavy
knot
usually
made
in
the
end
of
a
lineheaving
line
to
aid
in
accurate
throwing. |
|
moor
-
To
attach
a
boat
to
a
mooring,
dock,
post,
anchor,
etc. |
|
mooring
line
-
A
line
used
to
secure
a
boat
to
an
anchor,
dock,
or
mooring. |
|
mooring
-
A
place
where
a
boat
can
be
moored.
Usually
a
buoy
marks
the
location
of
a
firmly
set
anchor. |
|
motor
-
1
-
An
engine.
2
-
The
act
of
using
an
engine
to
move
a
boat. |
|
mount
-
An
attachment
point
for
another
object. |
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