RE: Garmin Blue Chip chart upgrades
I'm not familiar with your model. But I have a 4212 that uses the g2 chart which are different than yours,
I also have an older 3210 chartplotter and USB 2.0 card programmer that I use for it. *I bought mine off of ebay too and it is fine, just remember it is old technology and if the same as mine, will only work with a 32 bit pc computer, not with the newer 64 bit. *I have an older XP computer I keep for that purpose. *The switch to 64 bit occured with Microsoft Vista so you will see both 32 and 64 bit platforms. *I use 128 MB Garmin data cards which are also available on Ebay. *It's pretty easy to use and comes with the drivers and cable.