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Page
17
2011
Copyright
Traffic
Logix
Corp.
SafePace
100:
Installation
Manual
Ver.
2.0
Compass
Method
You
can
use
a
magnetic
compass
to
find
south.
The
compass
reading
must
be
corrected
for
the
magnetic
declination
in
your
area.
Magnetic
declination
is
the
difference
(in
degrees)
between
the
direction
the
compass
needle
points
and
true
north.
Magnetic
Declination
depends
on
your
location.
You
can
look
up
the
declination
for
your
area
at:
http://www.ngdc.noaa.gov/seg/geomag/jsp/Declination.jsp
.
Some
compasses
allow
the
declination
to
be
set.
If
yours
does,
then
just
set
your
local
declination
and
you
are
good
to
go.
If
not,
then
on
each
compass
reading,
you
must
offset
the
compass
needle
from
the
true
north
mark
on
the
compass
by
the
declination
angle.
For
example,
if
you
live
in
Bozeman,
MT
your
declination
is
about
14
degrees
east.
To
take
a
true
compass
bearing,
rotate
the
compass
until
the
needle
points
14
degrees
east
of
north
on
the
compass
bearing
scale.
If
your
declination
were
14
degrees
west,
you
would
rotate
the
compass
until
the
needle
was
14
degrees
west
of
north
on
the
bearing
scale
(it
would
point
to
360
‐
14
=
346).
Tax
Assessor
Maps
In
some
areas,
tax
assessors
offer
downloadable
maps
of
your
property
that
show
true
south.