Tap the Maps Folder
Tap the Blue button to the right of the map you want to inspect
Tap "Chunk Status"
The map display now shows colored blocks to indicate the status of each chunk
Green: Fully downloaded & Activated
Blue: Activated but not fully downloaded (DMS Selections only - Use the "Download All" feature to download the chunks that are missing)
Red: Downloaded in full but not Activated
No square: The chunk has not been fully downloaded and (for DMS Selections maps) is not activated
Zoom out to a smaller-scale basemap (eg 1:1M) to see an overview of your chunks.
Next: Loading Your Existing Maps