Creating maps while playing games such as Silversword

I have been playing Silversword. Anyone else been playing it? Well I have been using graph paper, a CCTV, and a lot of time trying to map out the game as I go. Over the weekend of losing a good amount of sight in my right eye for some reason, I can no longer use/make out my maps using my CCTV. So, I need to come up with an alternate means of mapping or give up the game. Does anyone know of an app I can use to create maps? I have tried using MS Excel but it seems way to difficult and clunky for this on my iPad. Any suggestions or ideas?