Thanks Thorsten, I suppose you can use {delete natural} instead of {set natural=""} too? Just in case one of these tags are on a highway or waterway line, I can remove those pois with these rules: # don't render not relevant mkgmap:line2poi tags amenity=* & mkgmap:line2poi=true {delete amenity} barrier=* & mkgmap:line2poi=true {delete barrier} historic=* & mkgmap:line2poi=true {delete historic} landuse=* & mkgmap:line2poi=true {delete landuse} leisure=* & mkgmap:line2poi=true {delete leisure} man_made=* & mkgmap:line2poi=true {delete man_made} natural=* & mkgmap:line2poi=true {delete natural} rcn_ref=* & mkgmap:line2poi=true {delete rcn_ref} place=* & mkgmap:line2poi=true {delete place} shop=* & mkgmap:line2poi=true {delete shop} sport=* & mkgmap:line2poi=true {delete sport} tourism=* & mkgmap:line2poi=true {delete tourism} Example of unwanted pois on a line element: leisure=track & sport=cycling http://www.openstreetmap.org/browse/way/41176449