[1] https://en.wikipedia.org/wiki/SD_card#SDIO_cards

Some early wireless cards used SDIO to communicate with the host computer. These are long gone.

There were also some later SD cards which contained an embedded controller running Linux, which emulated an SD storage card and exposed its contents over wireless. The latter are what that article was about.

It worked fairly well but at some point I got nervous that it might miss a photo and switched back to a boring SD card.

[0]: https://www.returnbooleantrue.com/2009/01/eye-fi-standalone-...

I wish camera manufacturers just used Android on their devices, with possibly 5G for geotagging and time sync. It would immediately solve all the connectivity issues.

I've flown some 172s. When the DA40 came out I thought it seemed like a really, really neat airplane. I got some marketing lit and talked to people about it from Diamond at Sun 'n Fun (in 2004, I think). It's nothing I could have even remotely approach buying then (or now, unless I wanted to live in it, I guess) but I just wanted to soak up some of the aura of the thing.

Database updates are still using SD cards though, but just a normal one as far as I know.