How do I update the maps on my Garmin device?

How do I update the maps on my Garmin device? How can maps be updated to reflect recent changes in roadways.
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bert [Entry]

If your Garmin GPS has an SD card, which most have, then use OpenStreetMaps. Just google 'OSM for Garmin', you will find that you can download weekly updated maps for most any country in the world for free. Garmin Topo maps use the same OSM maps but make you pay for them.