I bought my 997 in April of 2008 and have never run a software update on it. I was thinking the other day I better figure out how to do this because I really dont know. Anyway, i read on one message board where there had been a problem with updates displacing waypoints. Now that would not be a good thing for me. Does anyone know if this is indeed true or if its a known problem? Also how do you load updates from the humminbird PC site to a sandisk xtreme 3 card? Do card readers also upload information onto a card? In other words are they 2 way in terms of download and upload? I cannot seem to get an answer to how to simply get the updates onto an SD card so I can load it into the unit off the card. Any thoughts?