There is actually a free app in the apple app store that is a interactive map. It's quite good, you can zoom in/out, turn on/off landmarks etc. It's called "Bean Coast - DayZ Map and Guide". This is not for the standalone, and i never played the mod so I don't know how much is changed. There is another for the standalone which is also free, but I haven't checked it out yet. It's called "DayZ Standalone Map - iZurvive"