I think that is the latest version. I forgot to check mine this weekend. It is only a month or so old.
 
How does one go about updating the software? Mine is 5 years old so I know it is not the latest.

Thanks,
 
Any Garmin dealer can do it. I believe it requires a Windows program and serial connections to the back of the 327 along with power/ground. I don't recall exactly, but takes about 15 minutes or so. The files are available on the Dealer side of the Garmin website.

I would only bother with the upgrade if you have a specific need (like ADS-B support). My 327 was so old it didn't even have the RS232 setup page in the menu.
 
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