diff --git a/game/units/src/units_spacial_set.rs b/game/units/src/units_spacial_set.rs
index 647449a..9f08ade 100644
--- a/game/units/src/units_spacial_set.rs
+++ b/game/units/src/units_spacial_set.rs
@@ -1,5 +1,5 @@
-use bevy::prelude::Entity;
-use quadtree_rs::Quadtree;
+use bevy::prelude::*;
+use quadtree_rs::{point::Point, Quadtree};
 use shared::tags::Faction;
 use world_generation::hex_utils::HexCoord;
 
@@ -13,11 +13,29 @@ pub struct UnitEntity {
 }
 
 pub struct UnitSpacialSet {
-	tree: Quadtree<i32, UnitEntity>,
+	tree: Quadtree<usize, UnitEntity>,
 }
 
 impl UnitSpacialSet {
-	pub fn new() {
+	pub fn new(map_size: f32) -> Self {
+		let n = f32::log2(map_size) / f32::log2(2.0);
+		return Self {
+			tree: Quadtree::new(n.ceil() as usize),
+		};
+	}
 
+	pub fn add_unit(&mut self, unit: UnitEntity, pos: Vec3) -> Option<u64> {
+		let p = pos.xz().as_uvec2();
+		return self.tree.insert_pt(
+			Point {
+				x: p.x as usize,
+				y: p.y as usize,
+			},
+			unit,
+		);
+	}
+
+	pub fn move_unit(&mut self, handle: u64) {
+		todo!();
 	}
 }