A significant portion of storage space is used to cache data so the app performs well even with poor connectivity. If you have many saved places and tracks, it will require a bit more storage space.

Downloading maps offline, however, requires more of your storage space. As a reference, a map covering 5 nautical miles can take up about 25 MB of space. This is because the maps consist of many small images that are combined into detailed and zoomable maps.

Our recommendation is therefore to only download maps of areas where you know the connectivity may be poor.