Northrop Grumman Sperry Marine VisionMaster FT, User Manual

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Chart Datum Codes Radar/Chart Radar User Guide
Appendix A - 6 65900010
Code Description
SWA South West Africa
TAN Tananarive Observatory 1925, Malagasy Rebublic
TEC Tete, Mozambique
TIL Timbalai 1948 (datum point), Sabah (Bessel 1841)
TIV Timbalai 1948 (datum point), S Brunei (Everest)
TOK Tokyo, Japan
TOY Tokyo Astronomical Observatory (Old) 1918
VAR Varesmae (System 1937), Estonia
VID HMS Vidal 1967 Astro
VIN Vienna (Hermanskogel)
VLE
IGN 1957 (South Block, Tanna), Vanuatu (Also known as Tanna Astro
1957)
VOA Fort Charlotte, St Vincent
WAK Wake Island Astro 1952
WGC World Geodetic System 1972 (WGS 1972)
WGD World Geodetic System 1984 (WGS 1984)
YAC Yacare, Uruguay
YED Astro Yendegaia
XXX OSI & OGB
YYY IRL & OGB. These codes are used where a chart has been compiled
by fitting information on more than one datum directly to the chart
graticule without making adjustments for the shift between the datums.
They indicate that, at the scale of the chart, such differences are not
plottable, and the chart may be regarded as being on either datum.
UND Undetermined Code. UND is used where it cannot be stated with any
degree of certainty that positions read from the chart can be related to
any one horizontal datum. Where it is possible to separately identify
the datums to which different parts of the chart are referred, then the
chart will be subdivided for geographic referencing purposes. In
practice, there are large parts of the world where insufficient data
exists to relate a chart to any specific horizontal datum.