Either will work. I've used both with no issues. Make sure they are reformatted before you put any data on them or you run a risk of locking up the unit. I did it once with something on the card and locked it up. I had to send it back to Eufaula for a reload. I use a seperate card to load updates. I have another one with all my waypoints on. Always put the unit to default settings before loading software upgrades (another trip to Eufaula).
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