The Weelorum guide
https://weelorum.com/blog/guide-to-developing-a-gps-navigation-application/ to developing a GPS navigation application explains that building a location‑based app starts with understanding how GPS and related technologies like cellular networks, Wi‑Fi and Bluetooth work together to determine a user’s position, and then integrating essential features like interactive maps, real‑time tracking, offline functionality, voice control and smart notifications, while also planning things like market research, monetisation, UX/UI design, privacy compliance and scalable backend support so your app delivers accurate navigation, personalised suggestions and a solid user experience
