[mkgmap-dev] Serious Bug - Mkgmap creating map that puts news GPS (confirmed etrex 30, Oregon 550) into bootloop

Fri Feb 24 12:12:06 GMT 2012

Well I increased the maxnodes for the splitter, and even though the two 
tiles in the bay of Biscay, remained unchanged, it works without 
problems on my GPS now. The big problem remains, that for some countries 
with maxnodes 800000 I run into too large files, while for France 
(opposite side of the coin -- have a look into your maps of Europe - the 
smallest tiles will all be in France) with maxnodes 2400000 it compiles 
fine.
I tried before with default style-file, and the map also crashed the GPS.

So there is indeed the main problem, that the tiles become too small, 
and miss some information that they should include. Maybe somehow 
related to the POI index stuff??

I think the only real way out of it, would be to somehow merge mkgmap 
and mgkmap splitter functionality (e.g. somehow take into account the 
style-file for the splitters maxnode calculation). Or change mkgmap in 
such a way, that if a tile cannot be compiled because it is too big, it 
would automatically be split, and recompiled (but using a mapname that 
doesn't conflict...).

On 24.02.2012 10:24, Felix Hartmann wrote:
> Bang, I think that's it. I now managed to sent a map including the bay 
> of biscay (one tile), and looked if the other really small tiles 
> included cities/islands. Found one that didn't, left it out and the 
> GPS booted.
>
> IMHO (I'll try to simply include a city POI into the tiles of biscay) 
> - we would need to make sure, that each tile has a city or island 
> (0x650c)! Maybe that could be related to how the search function is 
> organised? Loading maps the GPS usually tries to set up the POI index 
> internally. Maybe that's why it crashes. Too few/no cities or no POI 
> at all, and bang.
>
> My next try will be to simply include city POIs with gpsmapedit into 
> each tile of the gulf of biscay, and recompile...
>
> On 24.02.2012 10:04, Felix Hartmann wrote:
>> I just tried - I left out the two main tiles of the Bay of Biscay, 
>> and it booted (and to confirm I created the gmapsupp.img with both 
>> mkgmap with and without address search, and also Mapsource). Leaving 
>> out either of the two tiles,
>> So leaves us to wonder, why is it not booting with them.
>>
>> The main thing inside those two tiles, is the ferry line, go straight 
>> across. Is it possible, that we have to use shorter staight lines? 
>> Where could I patch mkgmap to split up straight lines say 5x as often?
>> The other thing could be - that there must be at least one city POI 
>> in each tile (or at least any?? POI in each tile) - as both tiles 
>> don't have any city. And only one of the two tiles has a POI at all.
>>
>> I'll also try what happens if I create the map with default 
>> style-file. But I think it will crash the gps device too.
>> BTW -- I split france from geofabrik with max-nodes=1200000 and 
>> maxnodes=1300000 and both results in the same problem.
>>
>> Or do we have to make sure, that mkgmap never creates such empty tiles?
>>
>> On 23.02.2012 23:44, Minko wrote:
>>> On a Dakota 20 I can confirm this behaviour.
>>> If I leave only tile 63910019 out of it, it still won't boot up.
>>> I did not try it without tile 63910035.
>>> With a smaller mapset with 63910019 and 63910035 and a few others, 
>>> no problems.
>>> Also tried to leave out two other tiles in the north, but then it 
>>> still won't boot.
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