Garmin 512MB Data Card
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It doesn't get any bigger than this! Holds up to 512MB of data from MapSource CD-ROMs, so you can download a ton of street-level map detail, points of interest, business addresses, phone numbers and topographic information.
The 512Mb datacard works with the following GPS receivers:
- Garmin GPSMAP 276C, 376C, 378C & 478C
- Largest Garmin Data Card available
- Works in Garmin GPSMAP 276C, 376C, 378C & 478C
- Requires MapSource version 6.10.2 or later
- May require a firmware update for your GPS
