import kml files from Google?

In MyMaps on Google, you can export your custom route into a KML file. BaseCamp can import that and display the route properly. When that route is copied to my Nuvi, it has no waypoints, but is merely a route and while the Nuvi previews it correctly, it runs a point-to-point route based on the Nuvi defaults. Is the lack of waypoints the problem? If so, how do I get waypoints from MyMaps?