I downloaded the Mazda toolbox. when I started the program it says install sd card, well I don't have it so it takes me to another section. Like you said there might be no Thailand map because Mazda doesn't have sd card for Thailand which means why they are going to put Thailand's map into the system. Another thing i really annoyed with is, the seller didn't tell me about this. And when i asked him about the SD card he was like bla bla bla.. couldn't say anything about the card (it was not a language barrier because i can speak thai and esan fluently). Obviously, people are not happy about this and he didn't want to make it clear that there is no sd card for Thailand.i read his message but my feel worry about the map in Thailand may not be available in the mazda toolbox.
Anyway, this is the best potential solution.
I'm waiting for your test.
At the moment i bought a android car play USB which is really small and works great. It is a really small box where you connect your phone and then connect the device to your car's USB. It makes mirror and you can do whatever you want with your phone and maps too. mirroring your phone to your screen. its only 680 baht and bought from lazzada. If you want can give you the link here. There are more expensive ones and they are wireless. To be honest, works better than cars navigation plus its free. But again its just... my car has this option and i want to use it thing.