Assorted small changes.

src/exploration.rs

@@ -333,7 +333,7 @@ fn exploration_changed_announcement(
     query_pipeline: Res<QueryPipeline>,
     collider_query: QueryPipelineColliderComponentsQuery,
 ) -> Result<(), Box<dyn Error>> {
-    let (coordinates, exploring, viewshed) = explorer.single();
+    if let Ok((coordinates, exploring, viewshed)) = explorer.get_single() {
         let collider_set = QueryPipelineColliderComponentsSet(&collider_query);
         let coordinates = coordinates.floor();
         for (map, revealed_tiles) in map.iter() {
@@ -393,6 +393,7 @@ fn exploration_changed_announcement(
             }
             tts.speak(tokens.join(", ").to_string(), true)?;
         }
+    }
     Ok(())
 }
 

src/map.rs

@@ -22,8 +22,8 @@ impl From<mapgen::geometry::Point> for Coordinates {
     }
 }
 
-#[derive(Component, Clone, Debug, Deref, DerefMut)]
-pub struct Area(AABB);
+#[derive(Component, Copy, Clone, Debug, Deref, DerefMut, PartialEq)]
+pub struct Area(pub AABB);
 
 #[derive(Component, Clone, Default, Deref, DerefMut)]
 pub struct Map(pub MapgenMap);

src/navigation.rs

@@ -195,9 +195,10 @@ fn speak_direction(
     mut tts: ResMut<Tts>,
     player: Query<&CardinalDirection, (With<Player>, Changed<CardinalDirection>)>,
 ) -> Result<(), Box<dyn Error>> {
-    let direction = player.single();
+    if let Ok(direction) = player.get_single() {
         let direction: String = (*direction).into();
         tts.speak(direction, true)?;
+    }
     Ok(())
 }
 

src/visibility.rs

@@ -281,7 +281,7 @@ fn update_viewshed(
         if let Ok((viewer_entity, mut viewshed, mut visible_entities, viewer_coordinates)) =
             viewers.get_mut(*entity)
         {
-            let map = map.single();
+            if let Ok(map) = map.get_single() {
                 let mut cache = HashMap::new();
                 viewshed.update(
                     &viewer_entity,
@@ -296,6 +296,7 @@ fn update_viewshed(
                 );
             }
         }
+    }
 }
 
 fn remove_visible(