I went to update my Garmin GPS with the latest maps and it told me that the entire map wouldn't fit (US, Canada and Mexico). It said I could put the maps on an SD card to get the whole map set or else I had to pick only a portion of the lower 48 states (it wouldn't even fit the entire US only). t don't understand why as everything fit before.So, I picked up this SD card for the unit and it worked perfect. I now have the entire map set on the GPS. I just have to always leave the SD card in the unit which for me, isn't a big deal as I wasn't using the SD card for anything else before.