[Talk-GB] "GPS trace" tracking county boundary

Colin Smale colin.smale at xs4all.nl
Mon Dec 14 19:33:31 UTC 2020

On 2020-12-14 20:21, Edward Bainton wrote:

> With plenty of portages... 
> Glad I'm not going mad. Does it say anything useful or interesting that the "GPS trace" is a few metres away from the boundary as marked on the map? (Sorry if this has been answered recently: there was extensive discussion on alignment not long ago, but too technical for me to follow easily.)

If my suspicion is correct that a converted version of the OS
Boundary-Line data was uploaded as GPX, then the small shift just
indicates that the exact parameters used to convert from the OS
coordinate system (Eastings and Northings) to the system used by GPS and
OSM were different.
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