In Garmin Express, on Mac, I tried downloading the latest maps for my Nuvi 560. It doesn't have enough space on it so I went out and bought a 16GB Panasonic SDHC card, When I tried again, Garmin Express doesn't give me an option to use a memory card. Instead it forces me to chose a region when I don't want to. I want to have the entire North American map and I have an SDHC card but Garmin Express won't even give me an option to choose it