I've got a 998c si and can transfer all up grades and waypoints using the Humminbird software and a regular 4 GB SD card. It does not require anything special and 4 GB holds more than I will ever use. I think it will accept up to an 8 GB card if you want to record screen images. I bought a few off TigerDirect for less than $10. You can also buy upgraded maps, but they are nothing special for SW, LA and not worth the $199 in my opinion.
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