I am validating a safety-first concept for people who practice sailing, paddle boarding, kite surfing and similar sea sports. For this first low-budget MVP, I need a mobile app which is a reliable SOS signal that a user can trigger in one tap, even with spotty connectivity. I will hand over concise functional documentation, wireframes, copy, and a clear user flow. Your job is to turn that input into a lightweight, production-ready APK that a small pilot group can install and test in real conditions. Key elements I expect to see: • One-tap SOS that immediately raises an alert on our backend (or a lightweight third-party service you recommend) • Real-time location sharing while the SOS is active, visible on an in-app map view • Automatic notifications to predefined contacts via push and fallback SMS • A clean, intuitive UI that remains readable in bright sunlight and on wet screens Technical choices are up to you. After delivery I will run live trials with my pilot users; if the concept proves out, there is room for an expanded roadmap and long-term collaboration.