diff -r b3849a19d137 -r e737405b06dd src/ai/api/ai_error.hpp
--- a/src/ai/api/ai_error.hpp	Tue Apr 08 07:19:02 2008 +0000
+++ b/src/ai/api/ai_error.hpp	Tue Apr 08 07:24:23 2008 +0000
@@ -40,6 +40,7 @@
 		ERR_CAT_SIGN,     //!< Error messages related to building / removing signs.
 		ERR_CAT_ROAD,     //!< Error messages related to building / maintaining roads.
 		ERR_CAT_ORDER,    //!< Error messages related to managing orders.
+		ERR_CAT_MARINE,   //!< Error messages related to building / removing ships, docks and channels.
 
 		/**
 		 * DO NOT USE! The error bitsize determines how many errors can be stored in
@@ -89,7 +90,13 @@
 		ERR_LAND_SLOPED_WRONG,                        // [STR_1000_LAND_SLOPED_IN_WRONG_DIRECTION]
 
 		/** A vehicle is in the way */
-		ERR_VEHICLE_IN_THE_WAY,                  // [STR_8803_TRAIN_IN_THE_WAY, STR_9000_ROAD_VEHICLE_IN_THE_WAY, STR_980E_SHIP_IN_THE_WAY, STR_A015_AIRCRAFT_IN_THE_WAY]
+		ERR_VEHICLE_IN_THE_WAY,                       // [STR_8803_TRAIN_IN_THE_WAY, STR_9000_ROAD_VEHICLE_IN_THE_WAY, STR_980E_SHIP_IN_THE_WAY, STR_A015_AIRCRAFT_IN_THE_WAY]
+
+		/** Site is unsuitable */
+		ERR_SITE_UNSUITABLE,                          // [STR_0239_SITE_UNSUITABLE, STR_304B_SITE_UNSUITABLE]
+
+		/** Too close to the edge of the map */
+		ERR_TOO_CLOSE_TO_EDGE,                        // [STR_0002_TOO_CLOSE_TO_EDGE_OF_MAP]
 	};
 
 	/**