I have a picture of a map on my Android phone. I am looking for an app that can show my current location and direction overlaid on it.
The picture shows some local features that are not available in Google Maps or its alternatives. At the moment I have to switch between the image viewer and the map app, which is a bit cumbersome. I would prefer to add geospatial information to the picture by training it at a few known locations or overlaying it on top of Google Maps, and then use this information to show my current location right on the picture.
(Unfortunately all the terms I can use to describe such software are so generic that I get lots of unrelated results, which makes searching quite uneffective.)