RepeaterBook is a free application available for Android that provides a directory of repeaters across the world. This app is powered by the popular community database of RepeaterBook.com and software of ZBM2.com. It covers over 70 countries, including the USA, Canada, and Mexico, and it does not require a network connection to function. With RepeaterBook, users can easily find, select, sort, and display repeaters. The app displays distance, heading, and full repeater details, and it supports BlueCAT, a Bluetooth CAT interface for several radio models. Moreover, users can submit updates or additions from within the app. RepeaterBook is fast, flexible, and designed to help users use the repeater network efficiently.