Help!: [Sink] Exporting to Garmin Forerunner 305

I want to map a run (in another state) and export it to my Garmin Forerunner 305 so I can run this route when in that state next week without getting lost.  Is this possible.  I have tried and get to save the crs or tcx file and even download it to my Garmin device through Garmin Training Centre Software but there is no map - I don't think it imported correctly to Training Centre.  I usually use Sportstrack but there were errors importing it there.