I imagined calling 911 only to not know (under pressure) my exact address or where I put the RV park's receipt to find it! When seconds count, I don't want to be searching for our current address.
I also needed something to hang as decor in this area of my living room/kitchen.
Thus the ever changing address chalk board was born. I found these in the craft section of Walmart for just few dollars and the peace of mind they give me has been worth every penny.
I update them every time we move and now when I need to order something on Amazon, or give my address to order pizza, or put it in Google maps to find out where the closest Walmart is I have it close at hand.
To get the letters to be dark enough to be able to see them across the room I use chalk board marker (also available at Walmart in the craft isle).