Index: /applications/editors/josm/plugins/seachart/src/render/Renderer.java
===================================================================
--- /applications/editors/josm/plugins/seachart/src/render/Renderer.java	(revision 35482)
+++ /applications/editors/josm/plugins/seachart/src/render/Renderer.java	(revision 35483)
@@ -100,4 +100,12 @@
         Point2D point = context.getPoint(Rules.feature.geom.centre);
         Symbols.drawSymbol(g2, symbol, sScale, point.getX(), point.getY(), scheme, delta);
+    }
+
+    public static void colLetters(ArrayList<?> cols) {
+        	String str = "";
+        	for (int i = 0; (i < cols.size()) && (i < 4); i++) {
+        		str = str.concat(Rules.colourLetters.get(cols.get(i)));
+        	}
+        	labelText(str, new Font("Arial", Font.PLAIN, 40), Color.black, new Delta(Handle.TC, AffineTransform.getTranslateInstance(0, 40)));
     }
 
Index: /applications/editors/josm/plugins/seachart/src/render/Rules.java
===================================================================
--- /applications/editors/josm/plugins/seachart/src/render/Rules.java	(revision 35482)
+++ /applications/editors/josm/plugins/seachart/src/render/Rules.java	(revision 35483)
@@ -102,4 +102,22 @@
 		bodyColours.put(ColCOL.COL_MAG, new Color(0xf000f0));
 		bodyColours.put(ColCOL.COL_PNK, Color.pink);
+	}
+
+	static final EnumMap<ColCOL, String> colourLetters = new EnumMap<>(ColCOL.class);
+	static {
+		colourLetters.put(ColCOL.COL_UNK, "");
+		colourLetters.put(ColCOL.COL_WHT, "W");
+		colourLetters.put(ColCOL.COL_BLK, "B");
+		colourLetters.put(ColCOL.COL_RED, "R");
+		colourLetters.put(ColCOL.COL_GRN, "G");
+		colourLetters.put(ColCOL.COL_BLU, "Bu");
+		colourLetters.put(ColCOL.COL_YEL, "Y");
+		colourLetters.put(ColCOL.COL_GRY, "Gr");
+		colourLetters.put(ColCOL.COL_BRN, "Bn");
+		colourLetters.put(ColCOL.COL_AMB, "Am");
+		colourLetters.put(ColCOL.COL_VIO, "Vi");
+		colourLetters.put(ColCOL.COL_ORG, "Or");
+		colourLetters.put(ColCOL.COL_MAG, "Mg");
+		colourLetters.put(ColCOL.COL_PNK, "Pk");
 	}
 
@@ -1009,4 +1027,7 @@
 				break;
 			}
+			if (Renderer.zoom >= 15) {
+				Renderer.colLetters(getAttList(feature.type, Att.COLOUR));
+			}
 			Signals.addSignals();
             addName(15, new Font("Arial", Font.BOLD, 40), new Delta(Handle.BL, AffineTransform.getTranslateInstance(60, -50)));
Index: /applications/editors/josm/plugins/seachart/src/render/Signals.java
===================================================================
--- /applications/editors/josm/plugins/seachart/src/render/Signals.java	(revision 35482)
+++ /applications/editors/josm/plugins/seachart/src/render/Signals.java	(revision 35483)
@@ -609,5 +609,5 @@
                     cats = (ArrayList<CatLIT>) atts.get(Att.CATLIT).val;
                 }
-                str = cats.contains(CatLIT.LIT_DIR) ? "Dir" : "";
+                str = (cats.contains(CatLIT.LIT_AIR) || cats.contains(CatLIT.LIT_AERO)) ? "Aero" : cats.contains(CatLIT.LIT_DIR) ? "Dir" : "";
                 str += atts.containsKey(Att.MLTYLT) ? atts.get(Att.MLTYLT).val : "";
                 if (atts.containsKey(Att.LITCHR)) {