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Conditional Symbology Procedure RESTRN01
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- Spatial Object(s): Area Attribute(s) used
13.2.10 Conditional Symbology Procedure RESTRN01Applies to: The following S-57 Object Class objects, but only when they carry the attribute RESTRN: TSSLPT, TSSRON, TSSCRS, DWRTPT, PRCARE, ISTZNE;FAIRWAY, DRGARE, ACHARE; CBLARE, PIPARE, DMPGRD, MARCUL; OSPARE, SUBTLN, SPLARE, MIPARE, ICNARE; TESARE. Spatial Object(s): Area Attribute(s) used: RESTRN (passed on to sub procedure RESCSPnn) User Parameter(s): Symbolize Area Boundaries (used by sub procedure RESCSPnn) Defaults: Display Priority given by look-up table; OVERRADAR priority given by look-up table; Display Category given by look-up table; Viewing Group given by look-up table. Remarks: Objects subject to RESTRNnn are actually symbolised in sub-process RESCSPnn, since the latter is also be accessed from other conditional symbology procedures. RESTRNnn merely acts as a “signpost” for RESCSPnn. Object class RESARE is symbolised for the effect of attribute RESTRN in a separate conditional symbology procedure called RESAREnn. Since many of the areas concerned cover shipping channels, the number of symbols used is minimised to reduce clutter. To do this, values of RESTRN are ranked for significance as follows: “Traffic Restriction” values of RESTRN: RESTRN 7,8: entry prohibited or restricted RESTRN 14: IMO designated «area to be avoided» part of a TSS RESTRN 1,2: anchoring prohibited or restricted RESTRN 3,4,5,6: fishing or trawling prohibited or restricted “Other Restriction” values of RESTRN are: RESTRN 9,10: dredging prohibited or restricted, RESTRN 11, 12: diving prohibited or restricted, RESTRN 13: no wake area. Note: Unlike all other originators of conditional symbology procedures, RESTRN is an attribute, not an object class. It is therefore not possible to provide viewing groups for the restrictions it imposes without creating undesirable complications in the procedure. Figure 26 RESTRN01 conditional symbology procedure 
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