Thank you all for your replies. Respect for what you keep doing to help a less experienced retired baker.
Sorry to flood you with this big post, but I'd like to understand what's happening with your help.
I installed everything from scratch. Without sd-card. iGO runs like expected.
I deleted everything I don't need (cars, buildings, etc) and now I have 1MB working space. So if I can't get it to work with an sdcard I'll do without.
But I will try to get it working first.
So, I inserted the sdcard and as expected iGO won't start, again the former mentioned error messages.
I looked into the phone settings and I see that the phone immediately switched to sdcard for writing.
It's in Dutch: I think it means :"default write to: the sdcard is checked". Don't know if that is important for iGO.
With only internal memory: in Total Commander I see different folder names.
Like the screenshot added only internal gives /storage/sdcard0/iGO
Spoiler: pic1
When I click in TC on root of the system/mnt (green line) result mnt/sdcard/iGO
When I click in TC on root of the system/sdcard result/sdcard/iGO
When I click in TC on root of the system/storage result/storage/sdcard0/iGO
Spoiler: pic2
SDcard inserted.
Spoiler: pic3
In TC: Internal memory changes to sdcard1, external sdcard to sdcard0.
When I click in TC on root of the system/mnt result mnt/sdcard2/iGO
When I click in TC on root of the system/sdcard result/sdcard/iGO
When I click in TC on root of the system/storage result/storage/sdcard1/iGO
SO, should I add all these folder structures in sys.txt when I want tot use the sdcard with addons?
Info in iGO:
Spoiler: pic4
Sys of installed working iGO without sdcard:
[Only registered and activated users can see links. ]
@GOLOM: Of course I meant like you said : map/poi/building/dem. Sorry if my post wasn't clear.
I hope this one is more.
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