Should be the same method even with a unit without an SD Card right? Just plug the unit into your PC copy the files from the GPS onto a disk or you PC desktop, or whatever, so you will have a backup of you maps and files.On the 510, does the SD card hold EVERYTHING? In other words, if I do a FULL back up using explorer and just copy all those files onto the new SD card it should work?
Just as long as you can have a backup I would think it would not matter if you had an SD Card or not...Correct me on this if I'm wrong? The SD Card is just another way of transferring files between your PC and you GPS. Just like on your digital cameras...
R Bell