The "best" map card is the one that has the detail you want where you want it.
You don't have to guess what Navionics has since you can view the current maps on the Navionics website's Web App.
If Navionics is your choice, the BEST card for the Elite models is the Navionics+. You can delete all that is on the card and only load the locations you fish. The less data on the card the better the unit will perform.
It is customizable for what you want for a year since all new purchases include a year of Freshest Data Updates.
If you already own a map card, you can get the same feature for $99 and use your card to active it. The product is Navionics Update.
The Update card becomes the 2GB version of Navionics+ and has no maps, you choose what to download to the card and like the Preloaded 16GB version, you can have the Sonar Charts map layer too.
You don't get that with the Premium version.
Edited by Wayne P. (09/24/15 09:22 AM)
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, 360, RC-1