You can calculate sea route distance in Google Maps from AXSMarine Distance Table. 
You have the options to select
- Start Port
- Destination Port
- Speed of the vessel
- Draft of the vessel
After setting the input parameters, you get
- the route plotted in the Google Map
- the total distance in nautical miles
- travel time in days
Here is a sample distance calculation from Kandla Port to Kolkata Port. Click the map for results.
If you want to try out, log on to AXSMarine. (To access the Distance Table you need to create a free account in AXSMarine)
If you have the account, log on directly to AXSMarine Distance Table.
Post in MarineBuzz on this day a year before:
Sea Turtle Conservation in India by Tree Foundation
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great web
i like bannanas
Thanks for the heads up! I didn’t know about this feature until I came across your post.
This is perfect for people who travel most by the sea. Is there also a calculation as to the time to travel based on distance.
This a good feature from Google. I just know it now.
GE as a mass-market visualization product is definitely a new step in the evolution of mapping and GIS, especially in the way it can be used with a couple of mouse clicks by anybody not expert in cartography.