Implementing offline maps in an OutSystems app can provide significant value, especially for applications used in areas with limited or no internet connectivity. Here’s a detailed guide on how to implement offline maps, including available features, types of map data, limitations, and examples.

Available Map Features Offline

When offline, the following map features can be available depending on the chosen map provider and the implementation:

1. Navigation: Basic navigation features such as turn-by-turn directions can be pre-loaded and used offline.
2. Geolocation: The device's GPS can still provide location data without an internet connection.
3. Search: Limited to the pre-downloaded map data. Full-text search might not be available.
4. Layers: Basic layers like streets, satellite, and terrain can be available if pre-downloaded.

Types of Map Data for Offline Use

1. Vector Tiles: Scalable and can include a lot of detail.
2. Raster Tiles: Image-based and can be used for satellite imagery.
3. Route Data: Pre-calculated routes for navigation.
4. Geolocation Data: Points of Interest (POIs) and other location-based data.

Limitations and Considerations

1. Storage: Offline map data can be large and consume significant storage on the device.
2. Data Freshness: Offline maps need to be updated periodically to ensure they have the latest data.
3. Functionality: Some advanced features like real-time traffic updates or dynamic rerouting based on current conditions won't be available offline.
4. Licensing: Ensure compliance with the map provider's terms of service for offline use.

Example of Integrating Offline Maps in OutSystems Mobile App

1. Install Required Forge Components:

   • Use existing Forge components like Mapbox Mobile or Leaflet if available.

2. Download Map Data:

   • Create logic to download map tiles and store them locally using device storage.

3. Display Offline Maps:

   • Use the stored map tiles to render maps when the device is offline.
4. Handle Offline and Online States
   • Implement logic to switch between offline and online modes seamlessly.
   • Use local storage to cache user data and map interactions when offline and sync with the server when back online.