Singletrack Mountain Bike Magazine

• Overview
• Bike Forum
• Chat Forum
• For Sale
• Wanted
• Forum Help
• Classified Rules

Bike Forum

1. IHN - Member

   I have 1:50k and 1:25k maps of the same area, but they don't quite 'line-up' - i.e. if I draw a route along a, say, bridleway on the 1:25k and the scale out to the 1:50k, the route's no longer on the bridleway its slightly off to one side. Same if I do it the other way round.

   Any ideas? I assume it's something to do with the datum in the maps.

   Posted 3 years ago #
2. glenh - Member

   It's possible to get a shift if you use the wrong geodetic system, but both the 1:50 and 1:25 map should use the same if they are both OS:

   http://en.wikipedia.org/wiki/OSGB36

   Posted 3 years ago #
3. druidh - Member

   Common problem. You can see the same if you draw a route along a 1:50k map and then "zoom out" to 1:250k on Anquet

   Posted 3 years ago #
4. Fagus - Member

   PIA that. Shouldn't happen but does, all the time. All maps, at whatever scale are supposed to be drawn from the same database

   Posted 3 years ago #
5. higgo - Member

   Same thing happens on TrackLogs. Pretty sure it's down to the OS data, not the software.

   I've got a route for Stanage Edge that runs parallel to the path on the ground. Following the GPS route precisely would have me over the edge for much of the way.

   Posted 3 years ago #

RSS feed for this topic

Topic Closed

This topic has been closed to new replies.