Quote Originally Posted by Neil View Post
@Skylinestar
Although a very nice and user-friendly program to use, MapSource is no longer supported by Garmin and is not recommended for creating CNNT images, particularly large ones. The recommended programs to use are BaseCamp & MapInstall. MS compiles img files somewhat differently and because it may create tiny errors in the resultant image, it's just not suitable to use with modern map files. Go to the [Only registered and activated users can see links. ] and you'll find plenty of links to help you, even with MS.
I have unlocked the map. In Mapsource Manage Map Products, the map is now shown as "Not Lockable".
I managed to create the gmapsupp.img using mapsource and load it to my SD card and fit it into my Garmin Nuvi 255W. Upon Nuvi startup, I got the message "Can't Unlock Maps" Is the img file locked or unlocked?