With the GPS mount devices, mainly the Nuvi models, you might have noticed the abbreviations of LM and LMT in the titles. You may have just thought they were random letters for product description purposes, but they do have a meaning and use. When you ever see a GPS with a tagline of LM, it indicates that you will receive free lifetime map updates. As you now know how the lifetime map updates from Garmin work, there is no reason to reiterate any information about that.
However, when you see LMT, it means that you get lifetime map updates plus traffic updates. The traffic updates come in handy in instances that you can save time and stress by knowing that a certain area is under construction or is in a traffic jam. So, whenever you see LMT, you know that you are getting the best functionality and features possible.