Folks  (well, the techno-enthusiasts among you anyway),

I just spent a few moments following up a tip-off I was given ages ago
... and had a look at the following web site.

http://www.hippsomapp.se/?lang=en

The web site English seems to make sense and they seem to have
implemented a serious amount of useful stuff, though unsurprisingly none
of their free maps are in the UK. Given the JPGs we're starting to put
onto the GMOA RouteGadget (which I can supply) should probably be
suitable for calibration, this app might deliver phone-based GPS dibbing !!

At £3.97 to download the full app, it's not exactly expensive. Anyone
feel inspired to have a play ?

John