To specify a navigation title for a DITA map, include the following setting in a chapter configuration file filename.ini named for the DITA file (see §42.1.1 Providing configuration files for individual ditamaps):
[DITAOptions] ; MapHead = navigation title for chapter map MapHead = Title for use by navigation links
Alternatively, you can insert a DITAMapHead PI marker in the file. The content of the marker becomes the navtitle attribute for the map generated from the file, overriding any value specified for MapHead.
When you provide a value for MapHead or insert a DITAMapHead PI marker, DITA2Go creates a <topichd> element at the start of the chapter map (effectively at map level 0) that contains the rest of the map entries.