There is a good FAQ on SD card usage at But, if the nuvi 350 does not already have lifetime maps, you have the question of whether or not to buy the maps or a new unit. My sister does not remember whether she bought the Life Time Map upgrade feature or not.I guess with the cost of map upgrade going for from Garmin, it may be cheaper to go out and buy a more modern GPS at or around the cost of the map upgrade. Fred The new maps should run just fine on an SD card ...It may be worth updating the maps if the battery is in good condition. The Nuvi 350 has an mp3 player built in, which hasn't been in more modern nuvi's fo a long time too. there is not enough internal storage space on her GPS to load the maps.Now, whether it's worth the expense to load the new maps (if she didn't subscribe to lifetime map) ... The City Navigator North America map image file size is currently about 1.98GB so a future update, maybe even the next map update, will result in a full North America map file size that exceeds 2GB.
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