If I go to Tools->Settings->Map->Map Info only the OSM map is enabled. 

However I believe the basemap - if I understood correctly what the basemap is - is always enabled 
by default since when zooming out I can see mountains and (high)ways outside the tiles I used for my osm map. 

I tried by renaming gmapbmap.img to gmapbmap.iii and restart the device, the result is worste since it can't route to most POIs/address now. 
By the way this also means that gmapbmap has some relations with routing on the osm map... confused!!!


Enrico

On Sat, Mar 30, Enrico Liboni wrote:

> Folks, I'm sometime getting routing issues to some POIs - most seems ok but
> some are always showing the problem. I'm wondering if what I'm hitting is
> the problem described at:
> http://wiki.openstreetmap.org/wiki/Mkgmap/known_issues#add-pois-to-areas_sometimes_places_the_POI_outside_the_polygon
> 
> Here's what happens:
> * In my garmin device I select a poi
> * the device calculates the route, but the purple path displayed  does not
> follow real streets (it goes mostly parallel to them - see below pictures)
>
> Any idea?

Do you have a second map installed and active, for example the basemap?

This looks like as if your map does not have routeable ways in the
near and the Garmin jumps to the basemap. At least this is what
happens if I see such a "broken" routing.

Solution: Disable the basemap.

  Thorsten