Specs, Features and Customer reviews for Garmin nuvi 40LM 4.3-Inch Portable GPS Navigator with Lifetime Maps (US). The nuvi 40lm is a gps available from Garmin that exactly what you would expect from a cheap gps product. This gps comes with 5 million points of interest, lane assist with junction view. It also includes FREE lifetime map updates. This model is that it should be very easy for people that never used a GPS device before to learn how to operate it. The Nuvi 40LM typically costs between $89.99 - $149.99.