Google Maps wants me to swim to Glasgow

So I wanted to get from London Victoria to London Charing Cross, and asked Google Maps for "walking" directions. This is what it gave me:


Google Map showing journey from London to Glasgow, mostly by sea
Yes, my destination is now Charing Cross in Glasgow – slightly out of the way (but arguably my fault). It also appears that I have to swim there. At least I get a stopover in Belgium!

To be fair, Google Maps did provide me with the following warning:

Walking directions are in beta.
Use caution – This route may be missing sidewalks or pedestrian paths.


How true – there aren't many sidewalks or pedestrian paths in the North Sea...