How do I put a square grid on top of existing Maps? I was using dungeon sketch but that app is over. I have not found an alternative.
What type of map making programs can I use on a tablet?
I know there's graphics programs which can add a layer to an existing picture, but I'm not sure which such programs might work on a tablet. Roll20 could do that too though it'd be fiddly. Are you looking to use the tablet as your battlemat or do you want to make a map on the tablet then get it printed out?
With dungeon sketch I can take a map and put a grid over it and have pieces that would lock into the grid. Yes I would like to use my tablet as a battle map. Any suggestions would help.