capttim
As far as the data on your SDHC card, you may want to keep it on your computer, then if it becomes significantly you may want to burn it on a CD. I keep my SDHC cards empty, the last thing you want to do is run out of space when recording a new area. I have two cards so that I always have an empty one, if I want to look at old data it can be reloaded on to a card to review. I use Humviewer most of the time to review my data which is kept on the computer, but it does not cover maps and a few other things, for these other areas we have to look at it on the unit.
George