There is now an explicit "remove true north" button to make it consistent with other buttons like remove georeferencing

src/blenderbim/blenderbim/bim/module/georeference/__init__.py

@@ -36,6 +36,7 @@ classes = (
     operator.GetCursorLocation,
     operator.ImportPlot,
     operator.RemoveGeoreferencing,
+    operator.RemoveTrueNorth,
     operator.SetBlenderGridNorth,
     operator.SetBlenderTrueNorth,
     operator.SetIfcGridNorth,

src/blenderbim/blenderbim/bim/module/georeference/operator.py

@@ -249,3 +249,13 @@ class DisableEditingTrueNorth(bpy.types.Operator, tool.Ifc.Operator):
 
     def _execute(self, context):
         core.disable_editing_true_north(tool.Georeference)
+
+
+class RemoveTrueNorth(bpy.types.Operator, tool.Ifc.Operator):
+    bl_idname = "bim.remove_true_north"
+    bl_label = "Remove True North"
+    bl_options = {"REGISTER", "UNDO"}
+    bl_description = "Remove true north"
+
+    def _execute(self, context):
+        core.remove_true_north(tool.Ifc)

src/blenderbim/blenderbim/bim/module/georeference/prop.py

@@ -82,7 +82,6 @@ class BIMGeoreferenceProperties(PropertyGroup):
     blender_offset_x: StringProperty(name="Blender Offset X", default="0")
     blender_offset_y: StringProperty(name="Blender Offset Y", default="0")
     blender_offset_z: StringProperty(name="Blender Offset Z", default="0")
-    has_true_north: BoolProperty(name="Has True North", default=True)
     true_north_abscissa: StringProperty(name="True North Abscissa")
     true_north_ordinate: StringProperty(name="True North Ordinate")
     wcs_x: StringProperty(name="WCS X", default="0")

src/blenderbim/blenderbim/bim/module/georeference/ui.py

@@ -157,8 +157,6 @@ class BIM_PT_gis_true_north(Panel):
             self.draw_ui()
 
     def draw_editable_ui(self, context):
-        row = self.layout.row()
-        row.prop(self.props, "has_true_north")
         row = self.layout.row()
         row.prop(self.props, "true_north_abscissa")
         row = self.layout.row()
@@ -178,6 +176,7 @@ class BIM_PT_gis_true_north(Panel):
             row.label(text="Vector")
             row.label(text=str(GeoreferenceData.data["true_north"][0:2])[1:-1])
             row.operator("bim.enable_editing_true_north", icon="GREASEPENCIL", text="")
+            row.operator("bim.remove_true_north", icon="X", text="")
             row = self.layout.row(align=True)
             row.label(text="Derived Angle")
             row.label(text=GeoreferenceData.data["true_derived_angle"])
@@ -213,13 +212,13 @@ class BIM_PT_gis_wcs(Panel):
             row.label(text="Unrecommended Transformation Found", icon="ERROR")
             row.operator("bim.enable_editing_wcs", icon="GREASEPENCIL", text="")
             row = self.layout.row(align=True)
-            row.label(text="X")
+            row.label(text=f"X ({GeoreferenceData.data['local_unit_symbol']})")
             row.label(text=str(GeoreferenceData.data["world_coordinate_system"]["x"]))
             row = self.layout.row(align=True)
-            row.label(text="Y")
+            row.label(text=f"Y ({GeoreferenceData.data['local_unit_symbol']})")
             row.label(text=str(GeoreferenceData.data["world_coordinate_system"]["y"]))
             row = self.layout.row(align=True)
-            row.label(text="Z")
+            row.label(text=f"Z ({GeoreferenceData.data['local_unit_symbol']})")
             row.label(text=str(GeoreferenceData.data["world_coordinate_system"]["z"]))
             row = self.layout.row(align=True)
             row.label(text="Rotation")

src/blenderbim/blenderbim/core/georeference.py

@@ -40,7 +40,6 @@ def edit_georeferencing(ifc, georeference):
         "georeference.edit_georeferencing",
         projected_crs=georeference.get_projected_crs_attributes(),
         coordinate_operation=georeference.get_coordinate_operation_attributes(),
-        true_north=georeference.get_true_north_attributes(),
     )
     georeference.disable_editing()
 
@@ -113,3 +112,7 @@ def disable_editing_true_north(georeference):
 def edit_true_north(ifc, georeference):
     ifc.run("georeference.edit_true_north", true_north=georeference.get_true_north_attributes())
     georeference.disable_editing_true_north()
+
+
+def remove_true_north(ifc):
+    ifc.run("georeference.edit_true_north", true_north=None)

src/blenderbim/blenderbim/tool/georeference.py

@@ -114,13 +114,11 @@ class Georeference(blenderbim.core.tool.Georeference):
             return
 
         props = bpy.context.scene.BIMGeoreferenceProperties
-        props.has_true_north = False
         for context in tool.Ifc.get().by_type("IfcGeometricRepresentationContext", include_subtypes=False):
             if context.TrueNorth:
                 true_north = context.TrueNorth.DirectionRatios
                 props.true_north_abscissa = str(true_north[0])
                 props.true_north_ordinate = str(true_north[1])
-                props.has_true_north = True
                 return
 
     @classmethod
@@ -156,12 +154,10 @@ class Georeference(blenderbim.core.tool.Georeference):
     @classmethod
     def get_true_north_attributes(cls):
         props = bpy.context.scene.BIMGeoreferenceProperties
-        if props.has_true_north:
+        try:
-            try:
+            return [float(props.true_north_abscissa), float(props.true_north_ordinate)]
-                return [float(props.true_north_abscissa), float(props.true_north_ordinate)]
+        except ValueError:
-            except ValueError:
+            print("ERROR, True North Abscissa and Ordinate expect a number")
-                print("ERROR, True North Abscissa and Ordinate expect a number")
-                # self.report({"ERROR"}, "True North Abscissa and Ordinate expect a number")
 
     @classmethod
     def enable_editing(cls):