[mkgmap-dev] gpx track files do not work on routable maps

Wed Mar 7 12:40:23 GMT 2012

On Wed, Mar 07, 2012 at 11:15:33AM +0000, Eric Fernandez wrote:
>The routing almost work perfectly (using cycleways) until the very last 
>end: at around N55 degrees 27.922' / W003 degrees 39.085' then the 
>navigation jumps in a straight line to the end (going through 
>fields/unmarked areas).

That one does ring a bell. If you disable or remove the gmapsupp.img 
(Settings/Map, uncheck the box, or remove or rename the file), do you 
see a way on the base map (gmapbmap.img) where the straight line is? Or, 
if you rename the gmapbmap.img to something else, do you get a 'route 
calculation error' instead of the straight line?

One possible explanation is that there is an unconnected junction (two 
fully or almost overlapping nodes in the junction, or missing connection 
in a T junction) or that there is a highway=pedestrian area that is not 
being translated as a routeable way, but only as a polygon.

>This may be a stupid question, but is there any way to extract Garmin's 
>default styles from their gmapsupp.img file? This would allow me 
>distinguish between style problems and NOD building issue.

You mean, reverse engineer the style definitions from Garmin's 
commercial maps? It should be about as easy as unscrambling an egg. :-)

Have you tried different routing options? Instead of bicycling, try car 
(shortest route). Then it should ignore any cycleways or plazas that 
might be broken in the OSM data.

I should have a little more time in a week or two.

	Marko