In message , at
12:42:33 on Fri, 14 Feb 2014, gordonT remarked:

(we've got Google maps and ultrasound detectors - what could go wrong?)

The [lack of] correspondence between various mapping efforts, and where
tube lines actually are, has been discussed quite frequently (on u.t.l
at least). Even when such a maps claims to be geographical, it often
merely relies on "joining the dots" (ie the stations).

A quick look at Google maps ought to make this more obvious, rather than
less, for example here at Ealing Broadway (the District being the most
egregiously wrong): http://goo.gl/maps/xDyNf
--
Roland Perry