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Location: Green Bay, WI | Looks maybe like the MMC cards are able to be read by an SD reader, but possibly not the other way around.
http://www.diffen.com/difference/MMC_vs_SD_Card
You should make sure that your card is formatted correctly first, as specified by Lowrance's specs. But if it is already formatted, then try writing data to it from your PC, and then reading the files back again. In other words, make sure you can access the device before abandoning it for an MMC card. Otherwise, I would think you can get an MMC card from Amazon.com, or possibly even find them at Radio Shack or someplace similar.
TB
EDIT: I did a little research on this on my end, but could not find an actual "5200 iGPS" unit listed on Lowrance's site. I did find the 5300 iGPS though, and downloaded its manual. On page 22 it states that you can use either an MMC or an SD card...so I would think that your unit might well be able to use either of those two types as well. Do you by chance have a link to your unit on the Lowrance site?
Here is the page I used to find the manual for the 5300 iGPS:
http://www.lowrance.com/Root/Lowrance-Documents/GlobalMap5300ciGPS_...
EDIT #2: Steve, I don't see any 5200 iGPS listed in their product archive at all. I also suspect that the default file format for the older MMC card might be FAT16, and your new SD card might have a FAT32 format. I'm not certain about that however. I cannot seem to find any information about the format those older Lowrance units expect--so I can't be sure this is an issue. But if you CAN read/write from/to the card, see what format your computer tells you it has. Then if it's not FAT16, use Windows to try to format it to FAT16 (if that's an option for you even), and see if the Lowrance unit sees it then. NOTE: As I recall, Windows calls FAT32 "FAT32" but FAT16 is simply "FAT". So you might not see an actual "FAT16" option listed when you try to reformat the card, there might only be FAT and FAT32, is what I'm saying.
EDIT #3: OK, I think I might have found the problem. I think that your SD card is too big. I found reference to a statement on the Lowrance site that the 5300 iGPS (there is no 5200 iGPS on their site) can only use an MMC/SD card up to 2 gigabytes in size. So not only might the file format be an issue, the actual capacity of the card very well might be an issue as well. I'd still try to re-format the card if nothing else works though, and just see how it goes. You might get lucky. If not, you'll need to find a card no greater than 2 GB in size, and try that. It might need to be FAT16 though, so keep that in mind.
Edited by tcbetka 5/12/2013 5:09 PM
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