Index: src/django_gheat/wlheatmap/tile.py
===================================================================
--- src/django_gheat/wlheatmap/tile.py	(revision 9570)
+++ src/django_gheat/wlheatmap/tile.py	(revision 9571)
@@ -203,5 +203,5 @@
   })
   # Limit such that high level zooms does not get the whole database
-  metingen = Meting.objects.filter(**filter)[:1000].values_list('latitude', 'longitude', 'signaal')
+  metingen = Meting.objects.filter(**filter).order_by('?')[:1000].values_list('latitude', 'longitude', 'signaal')
 
   # XXX: Signal is not normalized in the database making it unknown when a