Translate about 99% in Garmin StreetPilot.
(the old th_TH.glx translate about 60% and not self selectable)
I also tested in the Nüvi 3590LMT® and works perfectly.
(Screenshot of the Nüvi 3590LMT®)
Inside is:
[Only registered and activated users can see links. ]
keyboards
• th_TH.kbd
[Only registered and activated users can see links. ]
Text
• th_TH.glx
• th_TH_PRX.glx
• th_TH_TRF.glx
[Only registered and activated users can see links. ]
voice
• Thai__.vpm
[Only registered and activated users can see links. ]
Copy all in folder Garmin.
Spoiler: Download
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