The ATT&CK Navigator is a web-based tool that provides visualization and annotation capabilities for MITRE ATT&CK matrices. The tool enables users to create custom views of the ATT&CK knowledge base through interactive matrix navigation. Key features include: - Matrix visualization with customizable cell annotations - Defensive coverage mapping to identify security gaps - Red team and blue team planning support - Technique frequency analysis and detection tracking - Custom layer creation for specific organizational views - Interactive navigation of ATT&CK tactics and techniques The tool supports various use cases including threat hunting, security assessment planning, and defensive strategy development. Users can manipulate matrix cells to represent different data points such as detection capabilities, threat actor behaviors, or security control effectiveness. The Navigator integrates with the broader MITRE ATT&CK framework to provide structured threat intelligence visualization and analysis capabilities for cybersecurity professionals.