Getting Official Garmin Map Updates Using Maps from Other Sources Community Q&A Before you go on a road trip, you may want to update the maps on your Garmin Nuvi GPS device so you have the latest map data and won’t get lost.
That and I don't have to worry about hearing the nivi give tts directions even at freeway speeds with the windows down in my diesel truck.
SD cards can be used to store files such as MP3 audio files, JPEG picture files,2 or supplemental mapping.
All nuvi models will support SD cards up to 8GB in size.
Good times I'm using an 8gb SDHC class 4 card with no real problems, but my Nuvi 750 (fully updated ver 4.10 and all other files) seems to have a limit of about 2500 MP3's.
Answer: The slot on the side of the nuvi is used for a Secure Digital (SD) card. These memory cards come in various sizes and are usually sold as either a micro SD or regular SD cards.Regular SD cards are larger and micro SD cards are much smaller.