I have read throughout the forum that the Sandisk Extreme III card is used/mentioned for use in humminbird finders. I have not been able to find these locally, so I found them online. When I received the SD card it was not the extreme III but a Sandisk Extreme SDHC UHS-1 card. My question is will this card work in a Helix 9 SI GPS. What other Sandisk SD cards that should be at local stores (Walmart, Office depot) would work without problems in the Helix? Thanks