Google earth has realtime GPS tracking capabilities?!?
Yes, Google Earth (Plus & Pro versions) accepts NMEA signals through a USB connection from a GPS unit. And while many people do not have broadband at sea it is possible to load a large cache of Google Earth maps onto your hard drive for use offline.
Here are some screenshots of the chart overlay I made. This is the first one I've done and I expect to be a able to create a better overlay after some practice.
Have they started putting depths on google earth sat photos? And listing nav aids and shipping channels?
I'm not sure, this is exactly the kind of information I am looking for. Ad-ons and plugins for Google Earth as well as other up-and-coming nav tech.