I use maps to see where my volunteers are. It would be cool to see them on a map with the electoral boundaries on top. Is it possible to change the “base layer” map from google or wherever to a google map that I had put the ward boundaries on.....? 😀
It is not really possible within CiviCRM. However if you are on Drupal you could create a view and put that view on a map with your own layer.
I think you should find the instructions at How to Map Contacts? helpful particularly the link to another Answer by Karin to this great answer How to put your CiviCRM Contacts on a Leafleft Map in 5min? which we have used and concur it gives us Maps with civi contacts