Index: trunk/src/extobj_helper.h
===================================================================
--- trunk/src/extobj_helper.h	(revision 28904)
+++ trunk/src/extobj_helper.h	(revision 28905)
@@ -112,7 +112,7 @@
 
 PCB_INLINE void pcb_exto_draw_makr(pcb_draw_info_t *info, pcb_subc_t *subc)
 {
-	pcb_coord_t x, y, unit = PCB_MM_TO_COORD(1);
+	pcb_coord_t x, y, unit = PCB_SUBC_AUX_UNIT;
 
 	if (pcb_subc_get_origin(subc, &x, &y) != 0)
 		return;
Index: trunk/src/globalconst.h
===================================================================
--- trunk/src/globalconst.h	(revision 28904)
+++ trunk/src/globalconst.h	(revision 28905)
@@ -72,8 +72,8 @@
 #define PCB_MAX_MODESTACK_DEPTH         16  /* maximum depth of mode stack */
 #define PCB_MIN_GRID_DISTANCE           4   /* minimum distance between point to enable grid drawing */
 #define PCB_EMARK_SIZE                  PCB_MIL_TO_COORD(10) 	/* size of diamond element mark */
+#define PCB_SUBC_AUX_UNIT               PCB_MM_TO_COORD(1) /* size of the unit vector for the subc-aux layer */
 
-
 /**** Font ***/
 /* These are used in debug draw font rendering (e.g. pin names) and reverse
    scale calculations (e.g. when report is trying to figure how the font
Index: trunk/src/obj_subc.c
===================================================================
--- trunk/src/obj_subc.c	(revision 28904)
+++ trunk/src/obj_subc.c	(revision 28905)
@@ -433,7 +433,7 @@
 
 void pcb_subc_create_aux(pcb_subc_t *sc, pcb_coord_t ox, pcb_coord_t oy, double rot, pcb_bool bottom)
 {
-	double unit = PCB_MM_TO_COORD(1);
+	double unit = PCB_SUBC_AUX_UNIT;
 	double cs, sn;
 
 	get_aux_layer(sc, 1);