If you like the Navionics on your phone you can get the same maps with Navionics Hotmaps Platinum South Region, Hotmaps Premium South Region, and Navionics+
If you want the extra map layer the app has called Sonar Charts, that takes either the Hotmaps Platinum or Navionics+ cards. You would only get Sonar Charts when you update the card and select to include that with the update. Sonar Charts is FREE so it is not sold with the cards.
If you want the satellite overlay feature like the mobile app has, only the Hotmaps Platinum South Region would have that.
You won't get all the settings that the mobile app has though.
Your mobile app is updated automatically or you can do it yourself. When you purchase a map card, you get a year of Freshest Data updates, so if any changes are made, you can get those by updating the card.
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, 360, RC-1