COLREGs Sound & Signals is an Android-based educational app designed by madeof.blue that helps users learn ColRegs rules 34 to 37 and annex IV. The app is free to download and comes with premium content, ad-free, and does not require an internet connection. It is also noteworthy that the app does not collect or share any user data.

The app is designed to assist users in learning the sound and light signals of ColRegs. It is a helpful tool for anyone studying the COLREGs rules and is looking for a practical resource to learn through. COLREGs Sound & Signals is compatible with Android 13.0 and is available for free on the Google Play Store.