Hi ThorstenI've noticed that pois are only searchable in mapsource if they appear in the mdr.img file.The categories are directly linked to the occurence of a poi type in the mdr subfile.This may not be what you are looking for but I'm examining the mdr structure myself and have written a small binary tool to extract the pois ( not addresses); it only reads NT and non NT mdr.img files. http://www.pinns.co.uk/osm/bits/mdr_pois.zip <http://www.pinns.co.uk/osm/bits/mdr_pois.zip> Interestingly,a) TOPOs only seem to include pois with 1400+ rangeb) There is another byte attached to each indexed poi - mkgmap seems to set it to 0 - No idea what it does but I have seen values 1-16 elsewhere.Nick -- View this message in context: http://gis.19327.n5.nabble.com/Tool-to-dump-index-tp5877646p5878725.html Sent from the Mkgmap Development mailing list archive at Nabble.com.