Have you tried a binary diff against the original file vs the one sendmap ends up putting on the GPS? Maybe that'll give some clues. CF> Hello list, CF> CF> Can anyone explain the following discrepancy? CF> CF> 1. I invoke mkgmap with CF> java -Xmx1500m -ea -jar ../mkgmap/mkgmap.jar -c UK_test_options.args CF> (see attached file for options) CF> 2a: I use sendmap to upload the file to my GPS CF> 2b: I copy the file manually to the memory card CF> Result of 2a: In the GPS, map tiles are listed as [description], CF> [family-name], [date of creation] CF> CF> Result of 2b: In the GPS, map tiles are listed as [description], CF> Area 6324999X, [date of creation] CF> CF> Obviously I'd like the maptiles to be listed as in 2a, but don't CF> want to have to use sendmap because it's much much slower than using CF> a card-reader. CF> CF> Any ideas on what's going on? CF> CF> -- CF> Charlie