Google Maps. Directions to Japan.
Type USA as your starting point.
Type Japan as your destination.
Look at direction Step #31
http://maps.google.com/maps?f=d&utm_campaign=en&utm_source=en-ha-na-us-google-dd&utm_medium=ha
Found this site today. http://demo.geogarage.com/noaa/
It overlays NOAA charts on top of Google maps. You can move a slider to control the transparency of the chart overlay. As you zoom in, it automatically switches to the more detailed charts.
Pretty cool.