according to Garmin Service in TW:
Our Traditional Chinese version Taiwan City Navigator map is only pre-installed on the local device (Taiwan version device).
We don’t sell this map and can not install the Traditional Chinese Keyboard on foreign devices. Sorry for any inconvenience.
If you want to use this device in Taiwan, please purchase the City Navigator Taiwan NT English version map SD/MircroSD card form in Taiwan.
This map doesn’t support 3D exit photo, 3D building information and doesn’t support TTS function.
If you purchase the SD card form insert this card into the device to navigate in Taiwan.
However, we have to remind you that we don’t provide update service for map SD card product.
Please link to the following page to see more information of Garmin City Navigator Taiwan NT English version map SD/MircroSD card format products.
Marketing Dept, GARMIN Corp.