Hi Bill, I don't understand what "layer 25" means, but these "spurious" lines look like the result of the line simplification that is used for lower resolutions. Maybe you see the overview map ? The overview map is not transferrred to the GPS device. Gerd ________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von 987654321@use.startmail.com <987654321@use.startmail.com> Gesendet: Mittwoch, 27. Juli 2016 16:54:35 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: [mkgmap-dev] spurious data showing in Basecamp Hi I am not sure if this is the place for this question. I have created a number of maps using the latest version of mkgmap. I then sent the maps to basecamp using mapsettoolkit as layer 25. Repeatedly, I see 1 specific issue. * If I install the map in basecamp as not transparent the map appears properly. * If I install the exact same map in basecamp as transparent, spurious lines appear. However, when I use Basecamp to install the maps on the Garmin, they show properly without the spurious data. Please see attached pdf showing Basecamp screenshots of the exact same area with the same dataset with the only change being the transparency setting. I have cleared the Basecamp cache over and over to no avail.. If this is not the correct place, would you please direct me to it. Thanks Bill * Windows 7 SP1 all updates 32 bit * Basecamp 4.6.2 * mkgmap dated 4-2-2016 * mapsettoolkit v1.77 * cgpsmapper 2.5.2