9. VECTOR (S57) CHARTS
9-3
[Projection]: Projection of current chart.
[Horizontal Datum]: Horizontal datum used with current chart.
[Sounding Datum]: Datum used to create sounding data.
[Vertical Datum]: Vertical datum used with current chart.
[Units of Depth]: Unit of depth used with current chart.
[Units of Height]: Unit of measurement used to measure height of objects above sea
level.
[Magnetic Variation]: Amount of magnetic variation. A positive value indicates a
change in an easterly direction and a negative value indicates a change in a westerly
direction.
[Quality Indication]: Quantitative estimate of the accuracy of chart features, given by
the chart producer.
9.1.3 Permanent warnings for S57 charts
Permanent warnings help you keep the installed S57 charts up-to-date and these are
shown at the bottom of the screen. Permanent warnings appear if the system detects
a condition that may cause a chart to be not up-to-date.
Note: The system can assist in keeping RENC-received charts up-to-date. For charts
that have been loaded from sources other than an RENC, the system is unable to
know the exact up-to-date situation.
Message Meaning, Remedy
Display Not Real Time Display date is not the current date. Set
Display date and Update Review date to
the current date.
No connection to dongle The dongle is not inserted or not recog-
nized. Insert the dongle to erase the mes-
sage.
Not up to date (SSE 27): XXXXXXXX
(Chart name appears at location of Xs.)
At least one chart is not up to date. Load
updated material.
Permit expired (SSE 25): XXXXXXXX
(Chart name appears at location of Xs.)
You have an expired permit for a chart. Re-
move the chart or renew subscription for
the permit.
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