Shoreline Defender addresses a specific legal challenge facing Florida beachgoers by providing real-time determination of public versus private coastal access. The application leverages multiple data sources including the device's GPS capabilities, tidal station information, and elevation calculations to establish whether users are standing on publicly accessible sand or private property. This fills a critical information gap in regions like Walton County where beach access rights remain contentious and poorly marked. The core functionality centers on a color-coded mapping system that displays green zones (public access) and red zones (private property) overlaid on the user's current location. The application processes real-time tidal data to account for the fluctuating mean high-tide line, which serves as the legal boundary between public and private beaches in Florida. Elevation calculations further refine accuracy, particularly on gradually sloping shorelines where visual determination proves challenging. Users receive immediate visual feedback through the interface without requiring manual data input. User experience prioritizes simplicity with a single-screen interface displaying the color-coded status, current tide information, and brief legal context. The design minimizes cognitive load through intuitive color associations and requires no technical expertise to operate. Real-world usage patterns indicate primary engagement upon arrival at beaches, with users typically checking status before settling in locations. The absence of complex menus or configuration options aligns with its purpose as an on-the-spot decision support tool rather than a comprehensive legal reference. User feedback consistently highlights the app's effectiveness in reducing uncertainty, with multiple reviews specifically praising its clarity and practical utility. Millmomof4 (July 4, 2025) noted the app 'eases the stress of finding access to enjoy the beautiful beaches,' while Elleays (July 2, 2025) described it as 'a required tool for beach visits' that explains public rights 'in a clear, super efficient way.' Beach admirer (June 26, 2025) emphasized how the app replaces 'estimates and supposition' with factual information. The application demonstrates notable strengths in its specialized problem-solving approach and elegant technical execution, though limitations include geographic restriction to Florida and dependence on cellular service for real-time data processing. Accuracy remains subject to the precision of tidal models and GPS positioning, which may vary under certain weather conditions or in areas with poor satellite reception. Ideal use cases involve beachgoers seeking to avoid unintentional trespassing and tourists navigating unfamiliar coastal regulations, though it should supplement rather than replace official signage or legal advice.