For the NUVI….Dan is correct. What is sad is the fact that you lose that routing capability with combination of mapsource and being able to push over routes and you own stuff to the GPS 🙁 Ah, marketing.
Also according to Garmin Forums the NUVI quarterally updates are minimal. As mentioned previously, not a lot “map” changes happen in these 1/4 releases, debug, corrections, etc. It still takes time to program in those map changes before you get it, but at least its available good or bad for the price you pay. One 1/4 maybe worth more than others, etc.
I found this online today as well regarding “Free” updates for non NUVI users, very interesting: