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Raster Chart material · 149
Datum and ARCS Charts
Difference between ARCS chart local datum and positions in WGS84
datum
The difference between ARCS chart local datum and WGS84 datum is known as WGS84 Shift. For most of the
ARCS charts this is known and the system can do conversion automatically. For some ARCS chart this is unknown
and the user is responsible to define it. For some ARCS charts this is partially known and the user is responsible to
define it for the unknown areas of partially known ARCS charts. See chapter "How to define User WGS84 Shift" on
page 153.
See also ARCS Navigator User Guide. It has a chapter "Use with GPS" about the datum question.
How the state of WGS Shift is indicated permanently
Cursor window does not have any warning. The
cursor position operates in user selected working
datum (see chapter "How to select Datum").
Cursor window does have warning WGS undefi. in
red colour.
The system still operates in user selected working
datum (see chapter "How to select Datum"). But the
system is unable to correctly do the transformation
between local paper chart datum and the user
selected working datum.
Cursor window does have warning WGS user in red
colour.
The system still operates in user selected working
datum (see chapter "How to select Datum"). But the
system use user defined WGS shift to perform the
transformation between local paper chart datum and
the user selected working datum.
How to check WGS shift status of the used chart
There is a WGS shift status -field in ARCS legend. Alternatives are as below:
WGS shift is defined for this chart. All latitude /
longitude positions of cursor, Routes, User Charts,
Pilot data etc. are correctly displayed on ARCS chart.