I have a Garmin 182C
chartplotter which I use with the BlueChart
charts on my PC. If you have used the BlueChart on your PC to save your waypoints, routes and trip data, then you can save them to an SD card and upload them to your "newer"
chartplotter.
I recently purchased a Garmin 4212 which uses the SD card format for their G2 Vision cards. I can now upload all my old waypoints and routes from my previous Garmin model (after saving them on an SD card). My first mate will now get to have her own chartplotter to keep track of "us". lol