Thanks lolypop000 but I downloaded that app and it says that I already have access to the SD card… Remember I am rooted already (and updated to 4.4.x recently from xda-developers)

However, it seems that the issue was resolution (not initially compatible) and testing different libgarminos.so files, I managed to make it work finally! (actually it was from your [Only registered and activated users can see links. ], dear lolypop000!)

I found a version of libgarminos.so that supports 1024x600 pixels properly, and now I have access to the application!

Here is my working libgarminos.so file, supporting Galaxy Tab III 7 inch (1024x600 resolution) for Street Pilot v2.33 and for /storage/extSdCard/Garmin/ folder support:

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The application runs OK, but now I have an issue where the start-up settings are NOT saved and I need to always select language/voice/theme/units. Any help on that, guys?

What mandilul posted on this, is it still valid for v2.33? "...Settings will always be lost until the first time when the phone will lock on sattelites and StreetPilot will display the map. After first sattelite connection, all settings will be retained." That's bad coding from Garmin, really!