Depth Contours - Raymarine LIGHTHOUSE 4 Operation Instructions Manual

The following Depth soundings options are available:
• [None] — No Depth soundings are displayed unless they are linked to a
depth contour.
• [Manual] — Depth soundings are only shown from zero to the depth
specified in the [Zero to:] option.
• [All] — All Depth soundings are displayed.
When [Show soundings] is set to [All] all depth soundings will be displayed.

Depth contours

Depth contours, also known as bathymetric contours or depth curves, are
lines drawn on cartography that connect points of equal depth creating a
visualization of underwater bottom structure. Contours use color fills to
indicate depth in relation to other contours.
Raster charts
On Raster charts, depth contours are fixed and are always displayed.
Vector charts
On Vector charts, depth contours can be customized from the [Depths]
settings menu: [Menu > Settings > Depths > Show contours.].
Depth contours include Depth soundings. The Depth contour soundings are
differentiated from other Depth soundings by using a white outline.
The following Depth contour options are available:
• [None] — No Depth contour lines or depth contour soundings are displayed.
• [Manual] — Depth contours are only shown from zero to the depth
specified in the [Zero to:] option.
• [All] — All Depth contours are displayed.
Note:
The Depth contours option does not affect the contour fill color.
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Example LightHouse™ Charts Depth contours
1. Shallow contour — Depths from zero to the depth specified in the
[Shallow contour] setting will be within the Shallow contour. By default,
the Shallow contour uses the darkest shade of blue.
2. Safety contour — Depths from the [Shallow contour] to the depth
specified in the [Safety contour] setting will be within the Safety contour.
The Safety contour uses a thicker line than other contour lines and is
colored using a medium shade of blue.
Important: The Safety contour should be set to the same value as your
vessel's [Minimum safe depth] and should be used to identify areas
where you should not take your vessel.
3. Depth contour — All Depth contours consist of a line and depth
soundings that appear along the line.
4. Deep contour — Depths from the [Safety contour] to the depth specified
in the [Deep contour] setting will be within the Deep contour. By default,
the Deep contour uses the lightest shade of blue. By default, depths
greater than the Deep contour will be colored white.
Shallow contour, Safety contour and Deep contour values can be customized
from the [Depths] settings menu: [Menu > Settings > Depths].