Hi Gerd, i have seen this strange message today too. If i have only 1 Zoomlevel (it's enough for mapsource/basecamp), there is no message. That's why, i believe that is not a problem with the TDB. (Of course, in the TDB need set the DEM-flag and list the DEM-files.) I see today, that for my gps-device (oregon 600) are more zoomlevels necessary. 1 zoomlevel is only enough for max. 800m-zoom. Maybe, we need maplevel - 1 zoomlevels for all zooms (?). When i build direkt a device-IMG with DEM-files with more zoomlevels, my oregon shows them all. (I add simply to all tile-IMG's the DEM-files and then i pack all files together.) But the reason for the senseless error-message from mapsource is obscure. I will make some further tests in the next days. Frank --- Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft. https://www.avast.com/antivirus