https://www.amazon.com/dp/B08R3Z71NW/ref=cm_sw_r_cp_apa_glt_fabc_S2W7FC6DBCX6TBD97DJ3 That's the one I got for the 2021. The older model years with the older connect system uses a different model number.

TD2K66EZ1 2021 Mazda CX-5 and CX-9 Navigation SD Memory Card for GPS OEM Part # TD2K-66-EZ1 FITS 2021 CX5 2021 CX9 https://www.amazon.com/dp/B08R3Z71NW/ref=cm_sw_r_cp_api_glt_fabc_09AJ2RD0DNVG0YXKPV7B?_encoding=UTF8&psc=1

I have the 2021 CX9 CE also. I purchased the navigation card from Amazon (for less than $50 at the time) and it works flawlessly.

I almost always use Android Auto for my navigation but have had a couple moments when I was out of service. So I got the navigation card as backup. I also have the Sirius subscription service called Travelink for 1.99 per month and that includes a weather map, weather info, gas stations nearby with prices, and a couple other things. It's not necessary but I like gadgets and felt like getting it. In order to have Travelink, you need yhe Nav card. Below is the link to the navigation card I bought on Amazon. (Assuming you live in US?)

Check this out at Amazon TD2K66EZ1 2021 Mazda CX-5 and CX-9 Navigation SD Memory Card for GPS OEM Part # TD2K-66-EZ1 FITS 2021 CX5 2021 CX9 https://smile.amazon.com/dp/B08R3Z71NW/ref=cm_sw_r_apan_glt_fabc_E346S1XW9TMZ6NKPE8S2?_encoding=UTF8&psc=1

No kidding, I bought this one 3 weeks ago for $50 and I see now it's unavailable: https://www.amazon.com/gp/product/B08R3Z71NW/ref=ppx\_yo\_dt\_b\_asin\_title\_o05\_s00?ie=UTF8&psc=1