diff --git a/ground_station/resources/core/mapping.py b/ground_station/resources/core/mapping.py
index d35bfbf..cae06d2 100644
--- a/ground_station/resources/core/mapping.py
+++ b/ground_station/resources/core/mapping.py
@@ -7,4 +7,20 @@ import urllib
 import PIL.Image
 from io import StringIO, BytesIO
 import os
-import time
\ No newline at end of file
+import time
+
+#####################################
+# Constants
+#####################################
+_KEY =  
+
+# Number of pixels in half the earth's circumference at zoom = 21
+_EARTHPIX = 268435456
+# Number of decimal places for rounding coordinates
+_DEGREE_PRECISION = 4 
+# Larget tile we can grab without paying
+_TILESIZE = 640
+# Fastest rate at which we can download tiles without paying
+_GRABRATE = 4
+# Pixel Radius of Earth for calculations
+_pixrad = _EARTHPIX / math.pi
\ No newline at end of file