Kongsberg Seatex AIS 100 Instruction Manual page 79

Seatex AIS 100 Instruction Manual, rev. 5
NOTE 1
NOTE 2
NOTE 3
NOTE 4
Three character alpha code for local datum. If not one of the listed
earth-centred datums, or 999 for user defined datums, use IHO datum
code from International Hydrographic Organisation Publication S-60,
Appendices B and C. Null field if unknown.
One character subdivision datum code when available or user defined
reference character for user defined datums, null field otherwise.
Subdivision character from IHO Publication S-60, Appendices B and
C.
Latitude and longitude offsets are positive numbers, the altitude offset
may be negative. Offsets change with position: position in the local
datum is offset from the position in the reference datum in the
directions indicated:
Plocal datum = Pref datum + offset
Users should be aware that chart transformations based on IHO S60
parameters may result in significant positional errors when applied to
chart data.
Only the local datum is required and used by the AIS.
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