This map is generally only enabled when I'm on a public walk (eg Sea2Source) or other event.
If you know me, you can also send me a location request on Google Latitude.
I also sometimes use MapMyTracks for live location tracking on walks - this may be more precise if enabled.
Last MapMyTracks location; may be outdated.
Tracks are often uploaded after the event to EveryTrail.
You may also be intererested in my GPX tracks which include some sections of the Thames Path.