Excerpt: An advantage to navigation GPS devices over using a smartphone app is the real-time traffic updates and assistance. Garmin has a program called Garmin Traffic on many of its GPS units, including the Nuvi 2577LT, that provides valuable traffic information when you need it. With a combination of useful features and lifetime traffic updates, the Nuvi 2577LT really shines as a GPS unit that is designed to help you navigate your way around tricky traffic situations.
Pros: This device includes lifetime traffic updates, lane assistance and a speed-limit indicator.
Cons: This GPS system does not come with lifetime map updates.