Is it possible to transfer favorites?
Yes, plug the Zumo containing the favourites to a computer so that you can 'see' the Zumo folders, Click on the GPX folder where there should be a file called Current.gpx, copy this file to a folder on your computer and then disconnect the Zumo from the computer, this file contains all your Favourites (Waypoints), as well as Routes and Tracks, you could simply copy this file to your new Zumo BUT BEWARE, if there is already a Current.gpx file on the new Zumo then all favourites in this file will be lost if you replace it. If your computer has Garmin Basecamp installed, it is possible to merge both new and old Favourites on the new Zumo, plug-in the new Zumo to the computer running Basecamp, then double clicking on the Current.gpx file from the computer's folder will automatically open Basecamp and display all data from the file, you can then select all the Favourites (Waypoints) you want to sent to the new Zumo and select Device >> Send To Device >> Send Selection To Device, this will add the new selection to any existing Favourites in the new unit