[OSM-talk] Routable Garmin maps

[Robert Vollmert]

>> It's now possible to get Garmin maps with routing made from OSM data.
>> Using a perl script that converts .osm to .mp which  can be converted
>> to Garmin binary maps.
>
> As far as I know this will only be possible using a commercial tool  
> called
> cgpsmapper which is not available for a reasonable price.
>
> Looks like there is a routing capable Version which costs 30 Euros
> but is limited to 2000 Nodes.

Since this is coming up all over the place, let me advertise the  
"open" approach:

The relevant part of the IMG format is mostly understood. In  
particular, enough is known to create a basic routing network. (The  
NOD file, http://svn.parabola.me.uk/display/trunk/doc/nod.txt. An IMG  
file is an archive of several different parts such as NOD.)

What appears to be missing is the extended header to the TRE file, to  
get the GPS receiver to actually load the map.

Steve Ratcliffe's display programs (which depend on mkgmap) can be  
used to display IMG maps as text, so if anyone feels up to a little  
reverse engineering, give it a try!

There's some pointers to further information on the wiki at http://wiki.openstreetmap.org/index.php/OSM_Map_On_Garmin/Format 
. I'm also happy to answer questions if somebody wants to look into  
this.

Cheers
Robert