SD Cards for Humminbird

I have just purchased Helix 7 GPS SI Trying to get information from Lake Master or Navonics is like pulling Hens Teeth. Lake Master does not have Lake D'Arbonne on the List of lakes in LA. It does appear to be on Navonics --- I just cant find if it is Compatible with Helix 7 --- My biggest question the Cards with the Micro SD card -- what does it do

The micro sd is just a miniature SD. When you purchase a mini, it usually comes with a full size sd card that it slides into to make it fit the sd size.

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All current LakeMaster Cards are micro SD card inside a full size SD card adapter ...

I'm pretty sure current Navionics cards are also ...

Rickie

Thanks guys that helps