SDHC for nuvi 260w

 
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RBF

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I believe the largest officially supported size is 8GB. See:

https://support.garmin.com/support/searchSupport/case.faces?caseId={a43e2650-1794-11e0-7efa-000000000000}

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nuvi 760, nuvi 765T, nuvi 855, nuvi 3790LMT, nuvi 3490LMT - SoCal area

16GB SDHC works for me

I think you will have no problem using even a 16GB card. Just make sure you have the latest firmware for the 260W.

I have used a 16GB SDHC Class 10 card both in my 2460, and in my 660, (much older than your 260W).

The card is a SanDisk SDHC Micro card, it fits into the 2460 direct, for the 660 I insert it into an adapter since the 660 uses a standard SD card.

I'm sure it would read even a 32GB card but have never tried it, nor would I ever need that much storage space for a GPS.

P.S. Make sure the card is formatted to Fat32.

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Nuvi 2460LMT 2 Units

My 750

I use a 32GB card in my 750. I use it because I had it on hand. Next map isn't going to fit on internal memory so I'm glad to have a card to use.