GpsPrune user guide
This product contains the download links for both the PDF and the EPUB versions of the user guide for version 21. Also included is the link for the guide for version 22, when it becomes available.
The PDF is 178 pages of A4 including dozens of colour screenshots; the EPUB has the same content but the number of pages depends on the screen size and font size.
More details at https://gpsprune.activityworkshop.net/userguide.html