I just looked at a chart, and it looks like your 3210 uses the same cards as my 2006c. So I can tell you what I have found out and done.
Here is the chart I looked it up on, by the way:
http://www.defender.com/html/chip_compa ... armin.html
So, the "Bluechart Data Cards" are no longer sold new (I mean, unless you find them new on a dusty shelf somewhere). You may have all the charts you need, but if not, I have found them on Craigslist and eBay. I also started a thread here to see if there was any interest in trading/loaning/etc. but it did not get a lot of activity. Of course that was not for a specific request at a specific time.
I've found it helpful when searching to "minus" the other formats so as to home in on the cards for our machines. In other words, if I searched on eBay my search might look like this:
Garmin Bluechart data card -G2 -SD -micro -nuvi
There is also a data card programmer (of which I bought one) but I never really got it working (didn't actually try though). I was thinking I would put it up for sale on eBay, but of course if you are looking for one just let me know.
As far as software updates, I found that the easiest way was to call Garmin and for $50 they sent me out an update card right away (shaped like a chart card and you can just pop it in the chartplotter). When I sent the card back (after using it), they credited me the $50. So I just had to pay for shipping.
One thing to note, especially if you have an older/original antenna, is that the antenna basically is the GPS, and it has its own update version (separate from the chartplotter), but that update is "pushed" through to the antenna when you do the update in the chartplotter. So the plotter will be at version 8.2 (or whatever) and the antenna at 2.7 (or whatever).
I had a problem where my plotter would work great but then suddenly (and repeatedly) lose satellites (then get them back, but that's no good when underway). As it turns out, an antenna update (i.e. the update through the update card) fixed the problem; BUT, I had a hard time getting the antenna to "take" the update. In the end it had something to do with WAAS, and I had to turn off WAAS, then do the update, then turn WAAS back on. Now it all works fine as far as I can tell (whew!) and the antenna is updated (I have the 17N antenna, although I could have bought a newer one). I don't know how similar the 3210 will be, but perhaps this info will help.
I also have some data showing which chart cards cover which areas, if that might be of help.
Sunbeam
