Northrop Grumman Sperry Marine VisionMaster FT, Руководство пользователя

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Basic Operation of Radar Radar/Chart Radar User Guide
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 The field to the right of the quality indicator denotes the datum used
for position data (defaults to WGS84). For information on WGS-84
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datum see `Factors affecting Chart Accuracy' in Chart Facility.
 The depth value as reported by the depth sensor. If no sensor data
is available a series of red dashes are shown in the field. The field
to the right of the depth value denotes the depth source sensor, i.e.
depth below keel (DBK), depth below transducer (DBT) or depth
below waterline (DBW).
 The system time shown as the current date and time in hours,
minutes and seconds. This can be either UTC or Local (local time
may have a time offset applied), depending on the selection of
system time made in Time Management. The current selection is
shown next to the time.
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World Geodetic System 1984 (WGS-84) is a chart datum model used by chart makers to
map the earth’s surface.