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[mkgmap-dev] splitter, mapid

From Gerd Petermann gpetermann_muenchen at hotmail.com on Mon Dec 17 06:57:30 GMT 2018

Hi all,

I've never tried it, but my understanding was that you can have the same tile (mapid) in two different gmapsupp files.
E.g. you might create a tile containing an area around Hamburg and put that tile into a gmapsupp for Germany as well as another
one for Lower Saxony.
If that is right it would explain why you have to make sure that the content of two tiles with the same id doesn't differ.

@Brad: I think the current documentation about the meaning of all those names and ids is not perfect because the authors of mkgmap
were still learning when the docu was created, and it's an ongoing process ;-)
Feel free to improve the docu (post a patch or maybe a new version of one or more files).


Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von brad <bradhaack at fastmail.com>
Gesendet: Montag, 17. Dezember 2018 01:47
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: [mkgmap-dev] splitter, mapid

One thing I think I missed, is that each tile on a garmin device needs a
unique mapid.   A different family-id and mapname for each gmap is not
sufficient.   Does this sound correct?

I'd been downloading US states from Geofabrik, creating maps with unique
family-id, mapname, every name & id that seemed important, (with
mkgmap)  but when I put them on the Garmin they all wouldn't show up.
Only when I went back to the splitter step & used a different mapid did
they all show up.

Sometimes I'm not too good at reading directions,  did I overlook this

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