I have a KML file that I am trying to load into Google maps. It zooms somewhere in the water with no route trace. This is the code I am trying:
var kmlLayer
Google Map needs to be able to access this KML file direclty, in other words, your KML file must be publicly available, and must end with .kml or .kmz extensions (I believe).
To make sure the KML file itself is correct, you can always go to maps.google.com and put the URL in the search bar, it should be automatically recognized and rendered.