[mkgmap-dev] Size limit for map tiles

Tue Mar 17 06:32:09 GMT 2009

On Mon, Mar 16, 2009 at 07:26:36PM +0100, Nop wrote:
>
> Hi!
>
> What is the size limit for mkgmap/garmin tiles? What amount of what data  
> triggers the error message "too large - map will not work"?

I don't know the answer, but I have some evidence that the "too large" error
isn't always triggered when it should.  A quote of my report at
http://wiki.openstreetmap.org/wiki/Mkgmap/routing/issues
follows:

"If I generate finland.osm (470,980,101 bytes, Feb 25 06:47 UTC) in
two tiles, my Garmin Edge 705 will pretend that the gmapsupp.img does
not exist (it will only display the base map). I assume that it is
related to too big tile size. Last time, I used these commands:

java -Xmx1024m -jar splitter.jar --max-nodes=2400000 finland.osm

java -Xmx1024m -jar mkgmap.jar --country-abbr=FIN --country-name=Finland \
--family-name=OSM --area-name=Finland --latin1 --gmapsupp --route \
-c template.args

This was with mkgmap r929 and splitter.jar (35,623 bytes, Feb 23 19:58 UTC).
(Where can I find the splitter.jar source?) With mkgmap r901, the two-tile
map of Finland worked. A three-tile Finland does work with r929.
--Skela 09:33, 26 February 2009 (UTC)"

IIRC, this was splitter -r25.  But I can't access http://svn.mkgmap.org.uk
right now, to be sure.  Also, IIRC, the maximum number of nodes per tile
was around 1,700,000.

	Marko