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Class 10 is fine, but hold the memory size to more than 8 gig. Anymore than that and you may run into trouble. I tried a 32 gig and it was not well received at all. So far, no problems with the 8 gig. Same unit as a Garmin 660 internally. I just bought one of those for another one of my bikes and it says 8 gig is max.
Anyone know what the requirements or limits for the add on microSD card for the Navigator IV GPS. Is there a maximum size you can use? is there a minimum or maximum class that one can use?
Thanks