The Muster App is safety operations software for yachts, managing crew operations, visitor security, and vessel inspections via iPads and crew devices. It integrates ISPS protocols, using OCR to scan IDs and capture visitor info. Visitors sign agreements on the device, and badges are printed with names, companies, and hosts. Welcome screens can match onboard branding. The software distinguishes between formal visitors and personal guests, allowing group boarding while maintaining individual records. Guest profiles include names, cabin locations, and documentation. Manifest data can be imported from spreadsheets. Muster drills track crew locations and issue alerts during emergencies, managing abandon ship protocols and roll calls. Inspection modules support checklists, with failed items generating follow-up tasks. Critical failures trigger alerts via push notifications or email. Checklists can be assigned to departments, and data is stored on encrypted UK servers.