Ham Square is a free iPhone application developed by Mark Turner that provides users with the Maidenhead Locator, also known as the "square", for their current location. This grid system is widely used by radio amateurs around the world as a simple and efficient way to represent and communicate a specific location.

With Ham Square, radio amateurs can easily determine their Maidenhead Locator by simply launching the app and allowing it to access their current location. The app then displays the square for their location, providing them with a quick and accurate reference point for their radio communications.

One of the key features of Ham Square is its simplicity and ease of use. The app has a clean and intuitive interface that allows users to quickly access their Maidenhead Locator without any hassle. Additionally, the app is free to download and use, making it accessible to all radio amateurs who are looking for a convenient way to determine their location using the Maidenhead Locator system.