Hi What size are you using for the tile splitter? and which options for mkgmap? always get this exception with the default --max-nodes 1600000 have played with java -Xmx and can use larger values but java doesn't allow more than 2600m Exception in thread "main" java.lang.OutOfMemoryError: Java heap space at com .sun.org.apache.xerces.internal.xni.XMLString.toString(XMLString.java: 185) at com .sun .org .apache .xerces .internal.util.XMLAttributesImpl.getValue(XMLAttributesImpl.java:557) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser $AttributesProxy.getValue(AbstractSAXParser.java:2323) at uk .me .parabola .mkgmap.reader.osm.xml.Osm5XmlHandler.startElement(Osm5XmlHandler.java: 131) at com .sun .org .apache .xerces .internal .parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:501) at com .sun .org .apache .xerces .internal .impl .XMLDocumentFragmentScannerImpl .scanStartElement(XMLDocumentFragmentScannerImpl.java:1359) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl $FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2747) at com .sun .org .apache .xerces .internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java: 648) at com .sun .org .apache .xerces .internal .impl .XMLDocumentFragmentScannerImpl .scanDocument(XMLDocumentFragmentScannerImpl.java:510) at com .sun .org .apache .xerces .internal.parsers.XML11Configuration.parse(XML11Configuration.java:807) at com .sun .org .apache .xerces .internal.parsers.XML11Configuration.parse(XML11Configuration.java:737) at com .sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java: 107) at com .sun .org .apache .xerces .internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl $JAXPSAXParser.parse(SAXParserImpl.java:522) at javax.xml.parsers.SAXParser.parse(SAXParser.java:395) at javax.xml.parsers.SAXParser.parse(SAXParser.java:198) at uk .me .parabola .mkgmap.reader.osm.xml.Osm5MapDataSource.load(Osm5MapDataSource.java:78) at uk.me.parabola.mkgmap.main.MapMaker.loadFromFile(MapMaker.java:137) at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java: 53) at uk.me.parabola.mkgmap.main.Main.processFilename(Main.java: 150) at uk.me.parabola.mkgmap.CommandArgs $Filename.processArg(CommandArgs.java:332) at uk.me.parabola.mkgmap.CommandArgs.readArgs(CommandArgs.java:119) at uk.me.parabola.mkgmap.main.Main.main(Main.java:91)