Tracker ... you cannot use the 4GB card. It must be a 2GB micro-SD to work in the unit. Bill has shown a good priced card, but if you don't have a card reader in your computer ... then you might want to consider purchasing this : 2GB microSD Secure Digital TransFlash Card with Reader (BMZ-C)
It's what I bought ... and the micro card fits into the larger holder card, which fits into the side of the flash drive reader, and that can be plugged into any USB 2.0 port on your computer. Then you go to the update link & follow the directions to download the update onto the card ... then put the micro card into your unit & turn the unit on and the update will load into the unit.
I have my update on the micro sd card ... I just haven't put it into the unit, yet. I'm still waiting to find out if any waypoint info could be removed by the update, but haven't had any replies, just yet. I don't think it would, and it shouldn't ... but, I don't want to risk losing any of my 100 waypoints, and have to manually re-enter them into the unit.
... cp :kewl

