SanDisk 4GB SD Memory Card + Black USB Memory Card Reader for Garmin Nuvi 200W, 205W, 250W, 260W, 600, 610, 650, 660, 670, 680, 710, 750, 760, 770, 780, 850, 860, 880, 200, 250, 255, 260, 270, 300, 310, 350, 360, 370 550 660 Review

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(More customer reviews)It's advertised here on Amazon that this SD card will fit my Garmin nuvi 850. WRONG. Check the specs on your Garmin before you order. I bet that you'll find that yours takes a microSD card.
The return to eTECH was very smooth and I got a refund but it didn't have to happen at all if the advertising was correct.

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