[OSM-talk] Mapping canals

[Richard Fairhurst]

matthew-osm wrote:

> With up to about a 20m error (which in practice seems to be about right), you
> might be out by ~65ft.
>
> (Granted, both points are likely to be out by the same amount if taken at the
> same time, but it's still a bit close IMO.)

Yup.

Actually the real issue is mapping tolerances. On the UK canals, every  
inch counts in lock length. There are locks that our 71ft 6in boat  
won't get through, but would if it were a few inches shorter. And  
there's no way my OSM skills are l337 enough to be able to draw a way  
precisely 71ft 6in long.

cheers
Richard