All examples of nuvi 3x0 i've seen have 'CAN 210' stamped into the case beneath the antenna flap to the right of the sticker with the model and serial number. Assuming it's a Western 310 i don't think it can fully use a dual map, it will display it though of course.

GU offers 3x0 nuvi series a language pack update for ไทย, but the 006B048201.bin it places on the unit doesn't seem to be utilised. WU offers a Thai non-TTS voice only, no other associated files such as KB/Text are downloadable to 3xx series, all that is firmware based.

[Only registered and activated users can see links. ] [Only registered and activated users can see links. ]

Setting locale to Other [no Thailand available in Western fw] makes no difference that i can see, no TH keyboard available and any TH language symbols are shown as Latin/Unicode gibberish but the TH non-TTS voice seems to work OK and the navigation instructions are shown on the top banner properly in English but Deutsch doesn't seem to display properly and contains some gibberish.

He could also try using the older English only map if he has a nuvi 310.