public static ArrayList<DownloadedFileData> availableOfflineMapRelatedFiles() {
        final ArrayList<DownloadedFileData> result = new ArrayList<>();
        for (Download.DownloadTypeDescriptor type : Download.DownloadType.getOfflineAllMapRelatedTypes()) {
            result.addAll(availableOfflineMaps(type.type));
        }
        return result;
    }
returns a list of downloaded offline map related files from all sources which are still available in the local filesystem
main/src/main/java/cgeo/geocaching/downloader/CompanionFileUtils.java