diff --git a/minimap.py b/minimap.py
index 571c4b4..fae6a87 100644
--- a/minimap.py
+++ b/minimap.py
@@ -75,6 +75,7 @@ def update_location():
         print('post.php', r.text)
 
 import math
+R = 6371.0
 
 def haver_dist(coord1, coord2):
     lati1 = math.radians(coord1[0])