Offline preparation along GPX track #990

Problem

The current "Prepare for offline work" feature downloads data only for the currently visible map area.

For field mapping, this is often not enough. After a full day of surveying, I usually return to the hotel and review my recorded GPX track from start to finish, adding and correcting OSM objects.

This means I have to continuously wait for map data, Notes and imagery to load while moving along the track, or repeatedly preload different map areas.

Proposed solution

Add a new option:

Prepare for offline work along GPX track

The user selects a recorded GPX track, and Go Map!! downloads all required data within a configurable distance (for example 200–500 m) on both sides of the track.

Data to preload

• OSM objects
• OSM Notes
• Satellite imagery (optional choice every time)

Benefits

• Smooth offline editing after field surveys.
• No waiting while reviewing long GPX tracks.
• Reduced mobile data usage.
• Especially useful for motorcycle, bicycle and hiking mapping where users survey long linear routes rather than a single area.

This would significantly improve the field mapping workflow compared to preloading only the current map view.