My Zumo is less than a year old, but I seem to be having a few software "glitches", so I ran my Garmin Updater software which can be downloaded at http://www8.garmin.com/products/webupda ... nstall.jsp. It will automatically identify your unit and download any updates. My Zumo had version 2.5 installed but Garmin has already updated to version 4.4. It installed in a matter of minutes and added many features that I complained were lacking before. Eg. show or hide visible tracks, added more fields to the trip data and also added a new compass page. Nice! Whatever Garmin you may have, it is worth a look to see what updates are available.