Declination
PLRF25C-1.2en
34
Declination
Declination explanation
• Within the context of using PLRF25C,
declination is understood as the deviation
between
magnetic north (MN)
and
grid
north (GiN)
.
• Anyway, depending on the country or
region declination possibly can be under-
stood as deviation between
magnetic
north (MN)
and
geographical north
(GgN)
.
To get the correct azimuth from PLRF25C
in a certain coordinate system:
1. The deviation between magnetic north
(MN) and grid north (GiN) of the speci-
fied coordinate system must be known.
2. This deviation must be set in the
DECLNATN
menu (see page 36).
•
Declination D:
Angle between GgN and MN
•
Declination d:
Angle between GiN and MN
•
Meridian convergence c:
Angle between GiN and GgN
GiN
-D
-c
-d
GgN
GgN
GiN=GgN
MN
MN
MN
-D
-d
GiN
-D
+c
-d