There are several iPhone apps displaying offline maps. Some of them can show custom maps, for instance loaded as MBTiles or sqlite files.
Galileo-app does this pretty well.
But it is only possible to display only one tiled map at a time. I need to display several tiled raster layers (say 3 or 4) with a transparency (for instance with an opacity control slider for each layer).
My rasters are hand drawn tracks (black 'wire' on white/transparent background), old maps tiles and openstreetmap tiles. Goal: find my way by crossing information from those georeferenced maps.
TiledMap app looks to be doing this, but is missing from iTune (dev account not renewed).
Is there any iOS app doing this? (Otherwise I would have to code one, but this is too much work)