Ham Square is a free application that displays the Maidenhead Locator, or "square", for your current location.
This grid system is used by radio amateurs worldwide as a convenient and short way of representing and communicating a location.
Details of more ham radio apps from KramStuff are at http://www.kramstuff.com
Update for iOS 11.
Ratings and Reviews
Great app but one minor issue.
This app works great but I don't know if it is just a screen issue for the iPhone 6 Plus but where the Grid Square Data is given there is white text blocking that data. Making it difficult to get that data. Everything else is perfect.
A fix is needed for it, to get the full 5 stars.
Go ahead and get this app
I've used this app in the middle of the Rocky Mountains to find the grid square. Worked great there and other locations.
Yes, the banner text interferes with the textbox giving me the grid square on my iPhone 6 plus. I just never really noticed it before.
Only works if you allow constant tracking
This app only works if you allow it to track your location even when you aren't using the app. I don't understand why it needs my location when I am not using it. Download other programs that do the same thing.
With Family Sharing set up, up to six family members can use this app.