Index: /applications/editors/josm/plugins/seachart/src/render/Renderer.java
===================================================================
--- /applications/editors/josm/plugins/seachart/src/render/Renderer.java	(revision 33194)
+++ /applications/editors/josm/plugins/seachart/src/render/Renderer.java	(revision 33195)
@@ -77,5 +77,5 @@
             g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_GASP);
             g2.setStroke(new BasicStroke(0, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER));
-            Rules.rules();
+            do {} while (!Rules.rules());
         }
     }
Index: /applications/editors/josm/plugins/seachart/src/render/Rules.java
===================================================================
--- /applications/editors/josm/plugins/seachart/src/render/Rules.java	(revision 33194)
+++ /applications/editors/josm/plugins/seachart/src/render/Rules.java	(revision 33195)
@@ -7,4 +7,5 @@
 import java.text.DecimalFormat;
 import java.util.ArrayList;
+import java.util.ConcurrentModificationException;
 import java.util.EnumMap;
 import java.util.HashMap;
@@ -251,5 +252,5 @@
     }
 
-    public static void rules() {
+    public static boolean rules() {
     	try {
         if ((Renderer.context.ruleset() == RuleSet.ALL) || (Renderer.context.ruleset() == RuleSet.BASE)) {
@@ -347,7 +348,10 @@
             if (testObject(Obj.BCNSPP)) for (Feature f : objects) if (testFeature(f)) beacons();
         }
+    	} catch (ConcurrentModificationException e) {
+    		return false;
     	} catch (Exception e) {
-    		return;	// Just skip this pass
+    		return true;
     	}
+    	return true;
     }
 
Index: /applications/editors/josm/plugins/seachart/src/symbols/Beacons.java
===================================================================
--- /applications/editors/josm/plugins/seachart/src/symbols/Beacons.java	(revision 33194)
+++ /applications/editors/josm/plugins/seachart/src/symbols/Beacons.java	(revision 33195)
@@ -75,4 +75,31 @@
     }
 
+    public static final Symbol Lattice = new Symbol();
+    static {
+      Symbol colours = new Symbol();
+      Path2D.Double p = new Path2D.Double(); p.moveTo(-20.0, 0.0); p.lineTo(-15.0, -70.0); p.lineTo(15.0, -70.0); p.lineTo(20.0, 0.0); p.lineTo(10.0, 0.0); p.curveTo(10.0, -13.3, -10.0, -13.3, -10.0, 0.0); p.closePath();
+      colours.add(new Instr(Form.P1, p));
+      p = new Path2D.Double(); p.moveTo(-20.0, 0.0); p.lineTo(-17.5, -35.0); p.lineTo(17.5, -35.0); p.lineTo(20.0, 0.0); p.lineTo(10.0, 0.0); p.curveTo(10.0, -13.3, -10.0, -13.3, -10.0, 0.0); p.closePath();
+      colours.add(new Instr(Form.H2, p));
+      p = new Path2D.Double(); p.moveTo(-18.3, -23.3); p.lineTo(-16.7, -46.7); p.lineTo(16.7, -46.7); p.lineTo(18.3, -23.3); p.closePath();
+      colours.add(new Instr(Form.H3, p));
+      p = new Path2D.Double(); p.moveTo(-17.5, -35.0); p.lineTo(-16.25, -52.5); p.lineTo(16.25, -52.5); p.lineTo(17.5, -35.0); p.closePath();
+      colours.add(new Instr(Form.H4, p));
+      p = new Path2D.Double(); p.moveTo(-18.75, -17.5); p.lineTo(-17.5, -35.0); p.lineTo(17.5, -35.0); p.lineTo(18.75, -17.5); p.closePath();
+      colours.add(new Instr(Form.H5, p));
+      p = new Path2D.Double(); p.moveTo(0.0, -70.0); p.lineTo(15.0, -70.0); p.lineTo(20.0, 0.0); p.lineTo(10.0, 0.0); p.quadTo(10.0, -10.0, 0.0, -10.0); p.closePath();
+      colours.add(new Instr(Form.V2, p));
+      Lattice.add(new Instr(Form.COLR, colours));
+      Lattice.add(new Instr(Form.STRK, new BasicStroke(4, BasicStroke.CAP_BUTT, BasicStroke.JOIN_ROUND)));
+      Lattice.add(new Instr(Form.FILL, Color.black));
+      Lattice.add(new Instr(Form.ELPS, new Ellipse2D.Double(-10, -10, 20, 20)));
+      Lattice.add(new Instr(Form.LINE, new Line2D.Double(-30, 0, -10, 0)));
+      Lattice.add(new Instr(Form.LINE, new Line2D.Double(10, 0, 30, 0)));
+      p = new Path2D.Double(); p.moveTo(-20.0, 0.0); p.lineTo(-15.0, -70.0); p.lineTo(15.0, -70.0); p.lineTo(20.0, 0.0);
+      p.moveTo(-19.0, -7.0); p.lineTo(17.5, -27.0); p.moveTo(19.0, -7.0); p.lineTo(-17.5, -27.0);
+      p.moveTo(-15.0, -65.0); p.lineTo(16.0, -45.0); p.moveTo(15.0, -65.0); p.lineTo(-16.0, -45.0);
+      Lattice.add(new Instr(Form.PLIN, p));
+    }
+
     public static final Symbol LightFlare = new Symbol();
     static {
@@ -203,5 +230,5 @@
     static {
         Shapes.put(BcnSHP.BCN_UNKN, Beacons.Beacon); Shapes.put(BcnSHP.BCN_STAK, Beacons.Stake); Shapes.put(BcnSHP.BCN_TOWR, Beacons.Tower);
-        Shapes.put(BcnSHP.BCN_LATT, Beacons.Beacon); Shapes.put(BcnSHP.BCN_PILE, Beacons.Beacon); Shapes.put(BcnSHP.BCN_POLE, Beacons.Stake);
+        Shapes.put(BcnSHP.BCN_LATT, Beacons.Lattice); Shapes.put(BcnSHP.BCN_PILE, Beacons.Beacon); Shapes.put(BcnSHP.BCN_POLE, Beacons.Stake);
         Shapes.put(BcnSHP.BCN_CARN, Beacons.Cairn); Shapes.put(BcnSHP.BCN_BUOY, Beacons.Beacon); Shapes.put(BcnSHP.BCN_POST, Beacons.Stake);
         Shapes.put(BcnSHP.BCN_PRCH, Beacons.Stake);