Cajun Bill
Yes you have it correct. You would remove the Navionics card and insert the SM card. Then when you get outside the area of the SM card just swap back to the Nac card. And to be clear. The SM cards ONLY work with the Elite 5 HDI and Elite 7 HDI. They work with any HDS unit or Simrad comparable too. Just make sure you have the correct unit before you spend $$ on SM cards.
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