[mkgmap-dev] MDR success and a couple of questions

Tue Sep 22 21:35:44 BST 2009

Hi Steve,

thats really good news ! I tried to embed your dummy mdr file into my 
map unfortunately my Nuvi was not impressed. It is still asking for a 
state but at least it didn't crash.

In one of your posts you mentioned that the "find" button gets enabled. 
Did you test it with MS or on your garmin device ? Did you just used the 
img with the dummy mdr file ?

Unfortunately I was not able to spend much time looking into MDR during 
the last months. So I have to dig into this again. According to my 
documents the nuvi at least requires the following MDR Records:

    1,   5,   11,    24 (country List ?),  25 (City Ref List), 29 
(Country List ?)

I found this out by removing section by section from the mdr header of a 
working file. I forgot if this file was MS generated or by cGPSmapper. 
Then I tried to put this records in one of my files but Nuvi didn't 
liked it much.

Berni.
>
> I've managed to construct a working MDR file with all of 2 POIs in it.
>
> This is with sections 1 (with empty subsections), 4, 9, 10, 11, 15.
> That appears to be the minimum number of sections to get anything to
> work.
>
> Interestingly, MDR 15 doesn't appear to be used much.  It supplies
> auto-completion results when typing in the search boxes, but the
> actual search results show the actual labels of the points.
>
> So 4 and 9 are required but I don't completely understand them, so
> does anyone know or speculate what the second byte in MDR 4 is?
> The wiki says 'kind of index', suggesting that it tells you which
> sections use that POI type.  If that is what is meant then what is
> the mapping?
>
> Secondly any ideas on MDR 9?  The first record always appears to be 01
> 01 00 00, and that is enough to make searching work in
> my simple example, but beyond that I have no idea.
>
>
> ..Steve
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