A Tier 3 walkie-talkie system is a type of Digital Mobile Radio (DMR) system that is designed for use by organizations that require a high level of security and reliability. These systems are typically used by public safety organizations, government agencies, and other organizations that need to communicate over long distances in challenging environments. Tier 3 systems are designed to provide a high level of security and reliability, with features such as encryption, remote programming, and national coverage. If you’re looking for a Best walkie-talkie system for personal use, you might want to consider the Caltta. This walkie talkie is are highly rated and offer a range of features that make them ideal for outdoor activities and other uses Tier III. DMR Tier III is a trunked radio system, which means that radios are automatically assigned to frequencies rather than having a fixed frequency, allowing for more efficient sharing of available radio channels among users. Tier III is designed for large networks with thousands of users.