As discussed in a Russian forum (http://n8xx.com/topic4627-karty-dlya...brazhenii.html) one can generate a Mappero-compatible (maemo-mapper N900) tile set with

tiles-merge.py --gtiles out_map

Then

cp -RL gtiles <my card>

or

tar chzf gtiles.tgz gtiles

to move or expand to /home/user/MyDocs/.maps/<repository-name>