Cool. That is the easiet. Now, if you don’t have a chip, run to walmart or best buy and get a little one. 32Mb would/should be more than enough. However if you plan to store your data on the chip long term, get a 128Mb.
I can’t recall the exact menu commands, but you should be able to get them from your users manual. Save to the MMC. Then move the chip over to your new unit and upload.
Personally I backup all my waypoints to the pc every so often just because you never know when that chip will get lost or damaged.
If you need help with specific menu commands let me know. I also need to know the model of the units you have.