This app was mentioned in 4 comments, with an average of 1.00 upvote
It's not hard to make a map, it's just time consuming. You simply plug a radio into each outlet, blasting loud, then turn off each circuit breaker until it stops.
For the ceiling lights, you need to march back and forth to see when it goes out, or have a helper yell at you. There is an app called "Two Way" which is like a walkie talkie for your phone, which makes this process really easy.
Two Way. It's works exactly like the old school one. It requires an internet connection (wifi works best for me) so you can talk with your buddy where-ever in the world she/he is. :D Just make sure that both of the party are in the same frequency by opening the keypad and dailing your own frequency and make sure that the other person is also on the same frequency.
Check the playstore for walkietalkie apps ;)