I am aware only about 1 model 2 models (July 2010/2553) sold in Thailand with the life time map update warranty, and it’s nuvi 215W and nuvi 205W
Conditions:
1. The company reserves the right to cancel or change the promotion without prior notice.
2. The lifetime map update warranty is applicable to the units that join the promotion only.
3. The lifetime map update warranty can’t be transferred or sold to any other units in any case.
4. The lifetime map update warranty would expired if there is a change in map format or system that render it incompatible with the unit.
The lifetime map update warranty would be suspended immediately to each unit’s S/N if the company finds out that there is a violation such as: copying, modifying, editing, selling of such warranty without the company’s consent.
Source: Garmin Thailand (ESRI)