Go to the system diagnostic view and see if the unit is recognizing a SD card in the slot boxes down in the lower right of the screen...
Rickie
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My uncle and I both have hb 798 units and when I try to export all his waypoints from his unit onto a scan disk so I can put them onto my unit it tells me that it was unable to perform the task... Any one have a idea why it won't allow me to do it?
Go to the system diagnostic view and see if the unit is recognizing a SD card in the slot boxes down in the lower right of the screen...
Rickie
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my 597 had the same problem i had to send mine back in to humminbird possible bad card reader
Gone Fishin
What version software do you have in your 798 unit?
Is this an SD or SDHC (2GB or larger) sized memory card?
Try formatting the memory card you are using and try again.
Also try what Rickie stated.