Updating garmin nuvi maps
You state you have an SD card with US maps and want to know if the maps on the SD can be updated. It will depend if the card is from Garmin, if so, the answer is no, the card cannot be updated.
That doesn't mean you couldn't overwrite the locked maps but Garmin would require the purchase of a new card if you want only the US maps that would then work in any unit.
You do have other options, that being purchasing a lifetime map update or switching to Open Street Maps.
I downloaded the latest map update, with Garmin Express, to my 2GB SD card and was only able to load the lower 48 because of a lack of space.
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I just bought a 4GB card and it is telling me the same thing.
When I try to select all maps the continue button is grayed out.
Is there anyway for me to get lifetime USA maps onto the SD card? You do have other options, that being purchasing a lifetime map update or switching to Open Street Maps.
Open Street Maps can probably be loaded to your SD card and they're free.
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It’s important to update your GPS maps, content and software on regular basis.