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

From Marko Mäkelä marko.makela at iki.fi on Wed Mar 7 21:16:56 GMT 2012

On Wed, Mar 07, 2012 at 08:13:55PM +0000, Eric Fernandez wrote:
>Many thanks. My file is different:
>$ ll /media/GARMIN/Garmin/gmapbmap.img.orig
>-rw-r--r-- 1 eric users 13123584 16 févr.  2011

Do you want to have a copy of my file?

>Marko: I have seen in the archives that you also reported that the base 
>map interfered with navigation on the Edge 705! Have you been able to 
>better understand the issue and correct it?

No, I was satisfied with my hypothesis (that the OSM data was to be 
blamed; there was a 'routing island').

>Or have you removed the base map entirely?

I cannot access the internal file system of my Edge 705 any more. The 
gmapbmap.img is there. I do not dare to use the device for recording 
traces, because I fear that it could corrupt the internal FAT again, and 
without a working USB interface, I cannot fix it. The only way I can 
control my Edge is by uploading maps or GPX or TCX files to the SD card.

>The difficulty here is that we may see several types of errors:
>- errors in OSM itself
>- interference between maps
>- buggy navigation algorithm of the 705.

Can you load the area around the route to JOSM and check that the ways 
that were replaced by the straight line are connected as they are 
supposed to be? That would rule out errors in OSM data.

>I believe that relying on one map only may be the way forward anyway.

I believe that the future belongs to the likes of OsmAnd. Their routing 
data structures probably are much worse than Garmin's, because OsmAnd 
can only calculate very short routes. But within a couple of years, it 
will be there. (Or, nobody else expect me has an issue with asking a 
remote server how to get from point A to point B.)


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