Chart Depth - Simrad Maris ECDIS900 Operator's Manual

Chart Depth

P
ROJECTION
ECDIS can display charts in different projections and guarantees the consistency between the
datum used by GPS and the datum used in ECDIS for display and storage of routes, tracks and
other objects.
The default projection is Cylindrical, which allows displaying a chart in a proper way even in
high latitude areas.
D
EPTHS
Deep and shallow contours can be displayed in two different colours. Switch the setting on
by toggling the box.
Deep contour: This function is used for setting deep-water contour highlighted in the
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display of S-57 charts.
Safety contour: This function is used for setting a safe depth range for the given ship. The
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calculated safety contour is equal to or larger than the entered value if the depth contour
chosen is not available on the chart. Safety contour highlights the safe navigation waters
(See example below) on the chart and ECDIS gives an alarm if the ship is going to cross
the safety contour within the time limits specified in the safety guard zone parameters. By
default the safety contour is 30 m. If the safety contour specified by the mariner is not in
the SENC, the safety contour shown is the next deeper contour and the mariner is
informed in the Legend panel. ECDIS emphasises the safety contour with a wide grey line
on the chart.
Shallow contour: This function is used for setting a shallow water contour highlighted in
•
the display of S-57 charts.
Safety Depth: This is the depth, in meters, below sea level that is considered to be safe
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for the ship. This is very important when the ship is approaching isolated dangers. On the
C D
HART EPTH