We are planning to implement a routing application to monitor marine traffic.
The issue is that we either need a data set that has international sea traffic routes data or a clear definition of it.
In both cases, we couldn't find a good resource. We found few resources such as geoweb.dnv.org/data and http://www.arcgis.com/home/item.html?id=3d82f13e484c4d3ca24345b796b76400 but it's limited for few areas, while we need to cover the whole globe.
to explain what I'm looking for, please take a look here: http://www.imo.org/OurWork/Safety/Navigation/Pages/ShipsRouteing.aspx
I found this dataset http://geocommons.com/overlays/25 but it's not quite accurate. I don't think it's based on the standard traffic routing system.