While running Phandelver and Below: The Shattered Obelisk I decided to forgo drawing the Wave Echo caves and put the map on the TV in my game room via iPad screen share to my Apple TV box.
I had the map up in Affinity Designer 2 so I could cover undiscovered parts of the map. But no matter what I did I could not get the screen to zoom in on any part of the map image, it only showed the full map on the screen.
I know I can purchase the module on roll20, or I can put the map in and draw on it to hide sections. But I am hoping for something more on the fly. I would prefer to use my iPad rather than my MacBook since it is more portable if possible.
With any VTT (including obsolete rolisteam), you can load an image as a map, and set up some fog of War.
No need to rebuy a dedicated module. Vanilla roll 20 does it