I have a KML file which works in the native google app if I add the URL in the search field. How does one pass a URL in Titanium.Maps to get it to display natively?
Yes it is possible. You can parse the KML with JS-Lib (XMLTools.js) or with ti.xml2json. More infos here: https://github.com/AppWerft/Botanischer-Garten-Hamburg/blob/master/Resources/vendor/KMLTools.js