ModRana is a flexible GPS navigation system for mobile devices. This is the main upstream modRana source code repository - waiting for your pull requests & patches! :)
Based on updated information a .nomedia file might not help to avert the MTP thumbnailing issues. Keeping open for the time being until more information is available.
Or else the MTP related mysncd chokes on trying to index all the thousands of tile images usually stored by modRana.