Remarks |
A light is one of the most complex S-57 objects. Its presentation depends on whether it is a light on a floating or fixed platform, its range, it’s colour and so on. This conditional symbology procedure derives the correct presentation from these parameters and also generates an area that shows the coverage of the light.
Notes on light sectors:
1.) The radial leg-lines defining the light sectors are normally drawn to only 25mm from the light to avoid clutter (see continuation B). However, the mariner should be able to select «full light-sector lines» and have the leg-lines extended to the nominal range of the light (VALMAR).
2.) Continuation B of this procedure symbolizes the sectors at the light itself. In addition, it should be possible, upon request, for the mariner to be capable of identifying the colour and sector limit lines of the sectors affecting the ship even if the light itself is off the display.
Further note:
The sub-procedure LITDSN, which generates the light description text-string, is provided on the Presentation Library CD as an independent 'C' function. Note that LITDSN does not use the default value for attribute VALNMR generated by CSP LIGHTS.
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