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I have the Nuvi 3580LM and it seems that with every map update, I always get the message that tells you maybe to load the maps on a memory card.
I am seriously looking at the Garmin® nüvi 2689LMT GPS...... Is there more memory in this unit ?
edited December 2015
Your 3580 should have 8gb, not sure about the 2689, Garmin does not publish that spec. But I'd be surprised if it had any more than 8gb. Garmin has a long tradition of being very stingy with internal memory.
16gb micro SD cards are cheap though and should give you lots of room for some time to come.