combining maptiles from individual maps in qlandkarte GT results in a non functioning gmapsupp.img file

[zenfunk]

When one combines individual maptiles from different maps (lets say from the south atlantic map and from the indian ocean map) then this results in a non functioning gmapsupp.img file. I guess this has to do with all the maptiles being named the same? All start at 63240001.img and upwards.

[Skippern]

Correct me if I’m wrong, but I believe that a proper tool for combining map tiles, such as JAVAWA can edit the tile IDs in order to avoid clashes. Also the combined map should have a unique map id, that way you can install more than one map on your Garmin device.

Aun Johnsen

On Feb 9, 2015, at 11:17, zenfunk notifications@github.com wrote:

When one combines individual maptiles from different maps (lets say from the south atlantic map and from the indian ocean map) then this results in a non functioning gmapsupp.img file. I guess this has to do with all the maptiles being named the same? All start at 63240001.img and upwards.

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[zenfunk]

Hm, I also thought that qlandkarte would take care something like that, it has the" export maptiles to gmapsupp.img" built in after all. My Etrex 20 is capable of displaying multiple maps at once, but somehow, it seems to not work with our nautical maps. Can anyone confirm/ or disprove that on their device?

[ehrenfeu]

I'm always using QlandkarteGT to select the tiles I want and export them into a gmapsupp.img. Tested on a GPSMap60csx, works perfectly.

[zenfunk]

Just to confirm this: It also works perfectly when you combine tiles from different maps?

[ehrenfeu]

Hum, I've never tried multiple maps to create a Garmin image. So I don't know, sorry.

Could this be a problem with the script that generates the Garmin charts? I have a vague memory that mkgmap supports specifying the ID for a series of map files, it just chooses the above mentioned ones if there is none given. So maybe this could be solved by choosing unique ID's for the different regions, probably based on the (not yet completed) data in the chart-sheet-properties repository?