It does not have to be registered or updated to use.
You have to register/renew the subscription to do more updates after the original one year of Freshest Data Updates expires.
They are not unit brand/model specific.
Put the card in your computer, open the drive that has the card, click on the Navionic Folder and see what the map dates are.
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, SOLIX 12 SI, 360, RC-1