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(a) This information is
cluded in the figure representing direction, such as
in the "Compass rose."
chart
gonic
which includes
gonic
chart is
isogonic
line
or west, that the compass
east
it
along an isogonic line.
as
travels
along an isogonic line,
from
declination
(b) This
declination
magnetic compass reading
reading.
(2) Turn
the
head points true north.
Slide
(3)
the
side
coincide
edges
represents
the
We can now find the apparent time (sun time)
(4)
locality
determining
by
of
section
the shadow cast
latitude
line which represents the
the nearest
degree.
solar
plate and read
hour
resent
each
into quarter
broken down
OPERATION INSTRUCTIONS.
3.
General.
a.
the sun
use
compass.
instructions
passes
will
derived
be
allows
driver
the
The
azimuth
from
obtained
a map.
converted to true azimuths.
be
Operation Procedure.
6.
Orienting the Vehicle
(1)
(a)
Set the timepiece
local apparent time
MAINTENANCE MANUAL
sometimes given on the map and in
It
can also
the
with
covered
represents
the
compass
the
true north.
must
to
date bar on the sun compass
solar plate along
with
the
of
day.
date
the
the
by the
Follow
time indicated.
the
of
day from
the
hours.
driver
The
of
If
the
the driver,
on to
from
the teamwork
concentrate
to
followed
to
be
NOTE
to a
to
paragraph
(see
obtained
be
locality in
isogonic lines.
continuous
of
degrees declination,
number
bears
needle
That
needle
added or subtracted
be
determine
true north azimuth
a
date bar
the
date line
the date bar which
on
time line indicated
center gnomon rod and
latitude of
line
time
the
The time lines rep
A.M.
6
vehicle or his assistant may
the
assistant reads
great deal
a
between
maintaining
on
predetermined course is
on a
Magnetic or grid azimuths must
:
Predetermined
with
the sun compass
used
be
section
1,
16
that
found
from
an iso-
question.
The iso-
Each
from
true north
at any point
is,
will
have the
same
to the
until
arrow
the
until
the
for
inter
by
the
locality
the
of
the
to
edge
P.M.
o'clock,
to
6
compass and
the
of
benefit
the two.
course.
the
Azimuth.
IV).
out
the
the
to
the
This
to
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