diff --git a/starmap/src/main.rs b/starmap/src/main.rs
index 0850cb9..8ec05b1 100644
--- a/starmap/src/main.rs
+++ b/starmap/src/main.rs
@@ -50,7 +50,7 @@ fn main() {
     app.insert_resource(systems::Spyglass {
         radius: 50.,
         fetch: true,
-        // filter: true,
+        filter: true,
     });
 
     app.insert_resource(systems::Fetched(HashSet::new()));
@@ -63,6 +63,7 @@ fn main() {
     app.add_event::<systems::Despawn>();
     app.add_systems(Update, systems::fetch);
     app.add_systems(Update, systems::spawn.after(camera::move_camera));
+    app.add_systems(Update, systems::visibility.after(systems::spawn));
     app.add_systems(Update, systems::labels::respawn.after(systems::spawn));
     app.add_systems(
         Update,
diff --git a/starmap/src/systems/fetch.rs b/starmap/src/systems/fetch.rs
index 0b223f8..d6fbd48 100644
--- a/starmap/src/systems/fetch.rs
+++ b/starmap/src/systems/fetch.rs
@@ -1,4 +1,4 @@
-use super::fetch_route;
+use super::{fetch_route, Spyglass};
 use crate::{search::Searched, Db};
 use bevy::prelude::*;
 use bevy::tasks::{AsyncComputeTaskPool, Task};
@@ -35,14 +35,6 @@ pub struct FetchTasks {
 #[derive(Resource)]
 pub struct Fetched(pub HashSet<FetchIndex>);
 
-/// A global setting which controls the spyglass around the camera
-#[derive(Resource)]
-pub struct Spyglass {
-    pub fetch: bool,
-    pub radius: f64,
-    // pub filter: bool,
-}
-
 /// Spawns tasks to load star systems from the DB
 pub fn fetch(
     camera_query: Query<&mut PanOrbitCamera>,
@@ -112,7 +104,7 @@ fn fetch_around_camera(
         let radius = spyglass.radius;
         let task = task_pool.spawn(async move {
             let cent = [center.x as f64, center.y as f64, center.z as f64];
-            DbSystem::fetch_in_range_of_point(&db, radius, cent)
+            DbSystem::fetch_in_range_of_point(&db, radius as f64, cent)
                 .await
                 .unwrap_or_default()
         });
diff --git a/starmap/src/systems/mod.rs b/starmap/src/systems/mod.rs
index 494caeb..3856446 100644
--- a/starmap/src/systems/mod.rs
+++ b/starmap/src/systems/mod.rs
@@ -1,4 +1,5 @@
 use bevy::prelude::*;
+use bevy_panorbit_camera::PanOrbitCamera;
 use elite_journal::Allegiance;
 use galos_db::systems::System as DbSystem;
 
@@ -19,12 +20,47 @@ pub use self::scale::*;
 mod spawn;
 pub use self::spawn::*;
 
-pub(crate) mod labels;
+pub mod labels;
 
 mod route;
 pub use self::route::*;
 
-pub(crate) fn system_to_vec(system: &DbSystem) -> Vec3 {
+/// A global setting which controls the spyglass around the camera
+#[derive(Resource)]
+pub struct Spyglass {
+    pub fetch: bool,
+    pub radius: f32,
+    pub filter: bool,
+}
+
+pub fn visibility(
+    mut commands: Commands,
+    camera: Query<&PanOrbitCamera>,
+    systems: Query<(Entity, &Transform), With<System>>,
+    spyglass: Res<Spyglass>,
+) {
+    // Make sure we make systems visible again.
+    if spyglass.is_changed() && !spyglass.filter {
+        for (entity, _) in &systems {
+            commands.entity(entity).insert(Visibility::Visible);
+        }
+    }
+
+    if spyglass.filter {
+        let camera_translation = camera.single().target_focus;
+        for (entity, system_transform) in &systems {
+            let dist =
+                camera_translation.distance(system_transform.translation);
+            if dist <= spyglass.radius {
+                commands.entity(entity).insert(Visibility::Visible);
+            } else {
+                commands.entity(entity).insert(Visibility::Hidden);
+            }
+        }
+    }
+}
+
+pub fn system_to_vec(system: &DbSystem) -> Vec3 {
     Vec3::new(
         system.position.unwrap().x as f32,
         system.position.unwrap().y as f32,
diff --git a/starmap/src/systems/spawn.rs b/starmap/src/systems/spawn.rs
index 4578cc3..4e6390b 100644
--- a/starmap/src/systems/spawn.rs
+++ b/starmap/src/systems/spawn.rs
@@ -82,7 +82,7 @@ pub fn spawn(
 }
 
 /// Generate all the star system entities.
-pub(crate) fn spawn_systems(
+pub fn spawn_systems(
     new_systems: &[DbSystem],
     systems_query: &Query<(Entity, &System)>,
     color_by: &Res<ColorBy>,
diff --git a/starmap/src/ui.rs b/starmap/src/ui.rs
index 79d9910..f9d2f73 100644
--- a/starmap/src/ui.rs
+++ b/starmap/src/ui.rs
@@ -100,8 +100,8 @@ fn settings(
         ui.add_space(2.);
         ui.checkbox(&mut spyglass.fetch, "Load Systems from DB");
         ui.add_space(2.);
-        // ui.checkbox(&mut spyglass.filter, "Hide Systems Outside Spyglass");
-        // ui.add_space(2.);
+        ui.checkbox(&mut spyglass.filter, "Spyglass Filter");
+        ui.add_space(2.);
         if ui.button("Despawn Systems").clicked() {
             despawner.send(Despawn);
         }