Android GPS Marine Plotter & Tracker App for Seychelles Waters (Samsung S25 Ultra)

I am looking for an experienced Android developer to build a GPS plotter and tracker application for marine/boating use in the Seychelles (Indian Ocean). The app will be installed and used primarily on... (Budget: $250 - $750 USD, Jobs: Android, Android App Development, Android SDK, Android Studio, App Design, Geolocation, GPS, Java, Mobile App Development)