I have made a couple of apps for in-situ data management, e.g.: - django-geo-spaas-metno-observation-stations - django-geo-spaas-metno-buoys - django-geo-spaas-noaa-ndbc In addition, we have in-situ drifters etc.; - django-geo-spaas-ais - django-geo-spaas-argo-floats - django-geo-spaas-svp-drifters There is some repetitive code in the managers of those apps, and I think we could benefit from making a parent manager in django-geo-spaas.