Dear Ballebar and others

Thank you for your exceptional respond. In the meantime I have realizes that I was mistaken. I did follow a procedure from marine forum which was somehow completely wrong. Therein it was explained that MobilePC could read the SD CARD ID and that for a SD Card containing a BlueChart g2 a sw.unl key needed to be generated using the number displayed in MobilePC. Thinking that I would need this key to unlock a BlueChartg2 map I use in my GPSMAP78 I run it in Jetmouse to create sw.unl and gmapsupp.unl, and naturally the BlueChartg2 showed up on the GPS. Yesterday I copied the map onto a different card and at last I realized that no sw.unl was needed for the GPS, just the unlock code generated from the GPS ID, consequently a sw.unl created using any number was just good for nothing. I did just for fun used ReadCID and the number obviously was very different. I sincerely apologize for the confusion I might have caused and hope I did not give you too much of a headache. Thank you again for your patience, the great explanation and guiding me finally on to the right course. (on land and on water)

Cheers