Yes, it works. But you must put poi.jpg in location, defined in Settings / POI / POI database (/home/user/.maemo-mapper/ by default). And not simply at location, where you found poi.db (for ex. /media/mmc1/maps/, where you keep maps, and old copy of poi.db may lasts).

I think I have it right. When I go to Settings > POI, POI database is set to /media/mmc1/maps/poi.db and the location of poi.jpg is /media/mmc1/maps/poi.jpg.

I tried putting the .db and .jpg in the default location, as well as other locations, nothing seemed to work.

I got it to work with specific to a category. I haven't been able to test yet where the error was. The only things right now I know for sure I did different;y is I used a .png file I used a .jpg file, and I used the method for changing a categories icon.

I am also having an issue with getting custom icons. I'm using WinGEO to create a poi.db for geocaching, I placed the GEO and GEO-FOUND jpegs in the dir with the poi.db and changed the path in the settings and they will not show up, this worked with an older version of maemo-mapper.

I have also tried using the default path as suggested by Dali and all I get is purple boxes...any advice? Gnuite? anyone?

My replacement poi jpegs are also .png files, with their extensions renamed.

This page also seems to indicate that you need to use PNG files, renamed to JPG.