Nuvi x0, x2, 1xxx, 2xxx, 3xxx, 2x5W, 465T and dezl 560 read Sandisk Ultra 64Gib SDXC reformatted as FAT32. Tested in 40, 42[40 convert], 50, 52[50 convert], 1300, 1350, 1390, 1450, 1490, 1690, 255W, 265W, 465T[255W convert], 2350, 2460, 3790, 3490[3790 convert], 3590, 3597 & 560[2460 convert].
All units with latest fw and all operate normally, except for being slow in loading maps on boot and lag after pressing map Info/MyMaps [not unreasonable when so much to process]. 1690 was the slowest to load the maps, taking about 35 seconds.
SP 26x0 fw v4.80 accepts 2GiB CF card and maybe 4GiB would also work. 2GiB tested in 2610. 4Gib CF works in sp2610 related hardware Honda GoldWing Navi 2006-2008. Tested in 2006 GW fw v2.50. Later GW Navi 2009-2010 accepts minimum of 4GiB SD by others' reports, not tested personally. Reasonable assumption would be that 2012-on dual-SD navi accepts at least 4GiB cards and probably much larger, but no reports known to me.



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