Hi, the following quote from cGPSmapper describes peculiarities of command "Background=Y": If there is only one object set as the background, then the EndLevel is automatically set to 9. If there is no background object, or more than one, then the EndLevel is not changed. As I understand, background is a special object for cGPSmapper. If there is only single background in a source, then compiler can modify EndLevel value. Mkgmap doesn't change EndLevel. I prepared a patch, that simply extends EndLevel for any background object, which contains only "Data0=" layer. I hope this should work for most cases. Proper solution would be to count all background objects and conditionally modify single background after reading an entire source file. -- Best regards, Andrzej