Google Earth marine application(s)
Check out what this French company is doing:
* shipwrecks plotted off the French coastline
* coastal aerial photos (of French Atlantic and Med) tie to Google maps
* raster nautical charts overlaid on Google maps (technology demo)
* tide predictions around the world
Heck, once broadband connectivity is available thru out the oceans of
the world (read cheaply) imagine how that will change navigation.