Index: src/django_gheat/gheat/management/commands/gen_tiles.py
===================================================================
--- src/django_gheat/gheat/management/commands/gen_tiles.py	(revision 9102)
+++ src/django_gheat/gheat/management/commands/gen_tiles.py	(revision 9105)
@@ -57,5 +57,5 @@
  #   collection = MeetRondje.objects.values('naam')
 #    for col in collection:
-    for tz in range(1, 21):
+    for tz in range(1, 22):
       #calculate start tiles
       mxmin, mymax = d2n.deg2num(float(start[0]), float(start[1]), tz)