Amazon.com: Professional Ultra SanDisk 32GB verified for Garmin Nuvi 3597LMTHD GPS MicroSDHC card with CUSTOM Hi-Speed, Lossless Format! Includes Standard SD Adapter. (UHS-1 A1 Class 10 Certified 98MB/s) : Electronics
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Amazon.com: Professional Ultra SanDisk 32GB verified for Garmin Nuvi 3597LMTHD GPS MicroSDHC card with CUSTOM Hi-Speed, Lossless Format! Includes Standard SD Adapter. (UHS-1 A1 Class 10 Certified 98MB/s) : Electronics
SD Memory Card Sizes for Automotive Devices | Garmin Customer Support