diff --git a/backend/src/gps.py b/backend/src/gps.py
new file mode 100644
index 0000000..546531b
--- /dev/null
+++ b/backend/src/gps.py
@@ -0,0 +1,27 @@
+import math
+
+
+class Coordinates:
+    latitude: int
+    longitude: int
+
+
+def distance_between_coords(lhs: Coordinates, rhs: Coordinates) -> float:
+    R = 6371000  # Earth radius in meters
+
+    def to_rad(deg):
+        return (deg * math.pi) / 180
+
+    d_lat = to_rad(rhs.latitude - lhs.latitude)
+    d_lon = to_rad(rhs.longitude - lhs.longitude)
+
+    a = (d_lat / 2) ** 2 + (to_rad(lhs.latitude) * to_rad(rhs.latitude)) * (d_lon / 2) ** 2
+
+    c = 2 * (a**0.5) / ((1 - a) ** 0.5)
+
+    return R * c  # distance in meters
+
+
+def is_within_range(my_coords: Coordinates, target_coords: Coordinates, max_range: float) -> bool:
+    distance = distance_between_coords(my_coords, target_coords)
+    return distance <= max_range
diff --git a/frontend/src/lib/gps.ts b/frontend/src/lib/gps.ts
index 7287833..f07e4c1 100644
--- a/frontend/src/lib/gps.ts
+++ b/frontend/src/lib/gps.ts
@@ -7,7 +7,7 @@ function geolocation_to_simple_coords(coordinates: GeolocationCoordinates): Coor
     return { latitude: coordinates.latitude, longitude: coordinates.longitude }
 }
 
-export function get_coords(): Promise<{ coords: Coordinates | null, error: string | null }> {
+export function get_coords(): Promise<{ coords: Coordinates | null; error: string | null }> {
     return new Promise((resolve) => {
         if (!navigator.geolocation) {
             resolve({ coords: null, error: "Geolocation is not supported by your browser" })
@@ -18,7 +18,7 @@ export function get_coords(): Promise<{ coords: Coordinates | null, error: strin
             console.log(gps_error)
             resolve({
                 coords: null,
-                error: `Unable to retrieve your location: (${gps_error.message})`
+                error: `Unable to retrieve your location: (${gps_error.message})`,
             })
             return
         }
@@ -26,7 +26,7 @@ export function get_coords(): Promise<{ coords: Coordinates | null, error: strin
         const success_callback = (gps_position: GeolocationPosition) => {
             resolve({
                 coords: geolocation_to_simple_coords(gps_position.coords),
-                error: null
+                error: null,
             })
             return
         }
@@ -34,29 +34,3 @@ export function get_coords(): Promise<{ coords: Coordinates | null, error: strin
         navigator.geolocation.getCurrentPosition(success_callback, error_callback)
     })
 }
-
-function distance_between_coords(
-    lhs: Coordinates,
-    rhs: Coordinates
-): number {
-    const R = 6371000; // earth radius in meters
-    const to_rad = (deg: number) => (deg * Math.PI) / 180;
-
-    const d_lat = to_rad(rhs.latitude - lhs.latitude);
-    const d_lon = to_rad(rhs.longitude - lhs.longitude);
-
-    const a =
-        Math.sin(d_lat / 2) ** 2 +
-        Math.cos(to_rad(lhs.latitude)) *
-        Math.cos(to_rad(rhs.latitude)) *
-        Math.sin(d_lon / 2) ** 2;
-
-    const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
-
-    return R * c; // distance in meters
-}
-
-export function is_within_range(my_coords: Coordinates, target_coords: Coordinates, max_range: number): boolean {
-    const distance = distance_between_coords(my_coords, target_coords)
-    return distance <= max_range
-}