I have never had a problem to install Sygic or TomTom NDS to the SD card.
The first think I do before I even side load an app is to check the systems setting and make sure it is set to install to SD CARD as default.
Each phone can be different in the settings.
Then I copy the GPS app to the SD Card root. (not to the internal memory)
The next thing I do is install the app (but do not start it yet!!!!!)
Then I go to setting and get to app section and pick TomTom NDS or what ever GPS you are installing and make sure I give it access to the SD card storage.
There is not need to root your phone.
Now start the app and go through the setup.
Download you home map.
Then shut down the app and go to the file browser and you will see that the GPS app had put the data on the SD Card.
You can even see before you start the app how much space in on the SD card before you download the maps.
Then check it again and you will see that some of the space has been used on the SD card. (that shows it has put the data aka maps on the SD
card)
It does not matter how much free space you have on the internal memory you can install to the SD card every time.
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