Humminbird nor Navionics has used strictly SD cards in several years. If your purchase was recent, likely you actually have a micro card with an SD adapter. You can easily remove the micro card from it's adapter by sliding it out of the bottom of the adapter.

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CampingEureka! | Jetboil
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FishingMinn Kota | Humminbird | Cannon
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DivingSCUBAPRO
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WatercraftOld Town | Ocean Kayak
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