With the sd cards, Can You safely store waypoints, recordings, snapshots and do updates on one card with no corruption of the card? If corruption is an issue, How do You deal with it? Especially corruption of updates? don't want to have to send my unit back to HB because I scrambled its brains. Is it safer to use one card for updates and another for all the other normal functions or can I get by fine with just one which is what I would prefer to do? Thanks. CF